Showing papers on "Vinyl acetate published in 1988"

Vinyl acetate-ethylene copolymer emulsions prepared in the presence of a stabilizing system of a low molecular weight polyvinyl alcohol and a surfactant

Abstract: A vinyl acetate-ethylene copolymer emulsion which is about 65-70% solids and has a viscosity of less than about 3,500 is disclosed. The emulsion is prepared by copolymerization of vinyl acetate and ethylene monomers in the presence of a stabilizing system consisting essentially of 2-4 wt %, based on vinyl acetate monomer, of a polyvinyl alcohol having a 100-600 degree of polymerization and 2-4wt %, based on vinyl acetate monomer, of a surfactant. Such emulsions demonstrate an improved speed of set as an adhesive.

Polymeric products of ethylene and vinyl esters

Abstract: Latices prepared by emulsion polymerisation comprise an interpolymer of (a) vinyl acetate, (b) ethylene and (c) the vinyl ester of a tertiary aliphatic carboxylic acid in which the acid moiety contains 9 carbon atoms. Such latices are particularly suitable for use in emulsion paints.

Thermoplastic resin composition

Abstract: PURPOSE:To obtain a thermoplastic resin composition processable by calendering, by compounding a thermoplastic resin other than polyvinyl chloride with p-t-butylbenzoic acid glycidyl ester and/or neopentyl glycol ester. CONSTITUTION:The objective composition can be produced by compounding (A) 100pts.wt. of a thermoplastic resin other than polyvinyl chloride, e.g. a polymer containing ethylene, propylene, styrene, (meth)acrylic acid ester, vinylidene chloride or vinyl acetate or a cellulose ester, etc., having a melting point of <=300 deg.C, preferably <=200 deg.C with (B) 0.1-5pts.wt., preferably 0.5-3pts.wt. of p-t-butylbenzoic acid glycidyl ester and/or neopently glycol ester. The obtained composition can be processed by calendering, has excellent workability and productivity and gives a molded article without causing the lowering of physical properties.

Melt transfer web

Abstract: A melt transfer web has a conformable layer which enables the melt transfer web to be used to transfer print uneven surfaces. In one embodiment the melt transfer web has a separate conformable layer and separate release layer. The conformable layer consists of copolymers of ethylene and vinyl acetate or copolymers of ethylene and acrylic acid which copolymers have a melt index greater than 30. The release layer consists of polyethylene films or ethylene copolymer films. In another embodiment a single layer of copolymers of ethylene and acrylic acid having a melt index between 100 and 4000 serves as a conformable-release layer.

Nonlinear Dielectric Relaxations in a Vinylidene Cyanide / Vinyl Acetate Copolymer

Abstract: The third-order nonlinear permittivity has been measured as a function of the frequency for an alternate copolymer of vinylidene cyanide and vinyl acetate at temperatures above Tg~170degC. The observed frequency spectra were found to be fitted by a function Δe3/(1+(i ωτ3)β3 )3 with negative Δe3. Its real part changes sign from positive to negative with decreasing frequency. A negative Δe3 implies that the polarization tends to be saturated as the field is increased. Combined knowledge about linear and nonlinear dielectric increments allows an estimate of the size of equivalent dipoles, which explains the unusually large permittivity of this copolymer.

Enzymic preparation of enantiomerically pure secondary alcohols. Ester synthesis by irreversible acyl transfer using a highly selective ester hydrolase from Pseudomonas sp.; an attractive alternative to ester hydrolysis

Abstract: A series of secondary alcohols [(R)- and (S)-(1)–(3) and (5)–(9)] of interest as attractive chiral auxiliaries were prepared in high chemical and optical yields via enzymic esterification under essentially anhydrous conditions by employing a highly selective ester hydrolase from Pseudomonas sp. and vinyl acetate as acyl donor.

Dermal bandage and dermal preparation

Abstract: A dermal bandage comprising a film-like adhesive material comprising at least one of polycarboxylic acids and polycarboxylic acid anhydrides, and a vinyl accetate polymer, and a dermal preparation comprising a film-like adhesive material containing drug, comprising at least one of polycarboxylic acids and polycarboxylic acid anhydride, and a vinyl acetate polymer are disclosed. The dermal bandage and dermal preparation exhibit strong adhesion of long duration only upon water absorption and is useful for prevention of running off of drugs applied to the skin or protection of affected parts of the skin.

Miniemulsion copolymerization of vinyl acetate and butyl acrylate. II. Mathematical model for the monomer transport

Abstract: A mathematical model is presented to describe the monomer transport between monomer droplets, aqueous phase, and polymer particles during the course of an emulsion polymerization. The model was used to investigate the role of the cosurfactant (hexadecane) in the miniemulsion copolymerization of 50:50 molar ratio vinyl acetate-butyl acrylate monomer mixture, as well as the effect of the different components and process variables on the rate of copolymerization, monomer distribution between phases, and composition of the copolymer.

Polymer composition, a process for producing a polymer composition, and the use of such a polymer composition

Abstract: This invention relates to a polymer composition comprising a) 30-70 parts by weight of one or more ethylene-propylene-­diene rubbers, b) 30-70 parts by weight of one or more ethylene-vinyl acetate copolymers with a vinyl acetate content of 18-40% by weight, and c) 1-25 parts by weight of one or more other polymers. The composition can be used with advantage, among other purposes for improving the miscibility of synthetic resins.

Block copolymers derived from azobiscyanopentanoic acid. X. Synthesis of silicone–vinyl block copolymers via polysiloxane(azobiscyanopentanamide)s

Abstract: The synthesis of silicone–vinyl block copolymers has been studied by the use of poly(azo-containing siloxaneamide)s (abbreviated as PASAs), i.e., polysiloxane (azobiscyanopentanamide)s as macroazoinitiators. PASAs with number-average molecular weight of 12000–31000 and with siloxane chain lengths of 250–9800 were prepared by the condensation of azobiscyanopentanoyl chloride and α,ω-bis(3-aminopropyldimethyl)polysiloxanes in equimolar feeds. Several kinds of silicone–vinyl block copolymers were synthesized by radical polymerization of vinyl monomers such as methyl methacrylate, styrene, and vinyl acetate, in the presence of PASA in homogeneous media. The block copolymers with siloxane contents up to 30 mol % were then characterized on the basis of infrared absorption, proton NMR spectra, and gel permeation chromatography.

Effect of impurities on emulsion polymerization: case I kinetics

Abstract: The effect of water- and monomer-soluble impurities on the kinetics of emulsion polymerization for Case I systems (e.g., vinyl acetate and vinyl choride) was investigated. Model predictions on the effect of these impurities on polymer particle nucleation and growth rate are shown to be in satisfactory agreement with experimental results. The effect of monomer-soluble impurities is shown to be quite different from that observed in Case II emulsion polymerization systems.

Detergent dispenser pouch made of cold water-soluble PVA containing acetalized units

Abstract: A pouched powder detergent is disclosed which comprises a powder detergent and a pouch containing the powder detergent, wherein the pouch comprises a cold water-soluble polyvinyl alcohol derivative containing 70 to 90 mole % of vinyl alcohol units, 0 to 2 mol % of vinyl acetate units and 10 to 30 mol % of acetalized vinyl alcohol units having an alkyl group containing 034 to 170 carbon atoms on the average, and having a viscosity-average polymerization degree of 200 to 500 with respect to the vinyl monomer units

Polymer mixtures for improving the low-temperature flow properties of mineral oil distillates

Abstract: Polymer mixtures for improving the low-temperature flow properties of mineral oil distillates Polymer mixtures of a copolymer (A1) made from 10-60% by weight of vinyl acetate and 40-90% by weight of ethylene or a copolymer (A2) made from 15-50% by weight of vinyl acetate, 0.5-20% by weight of C6-C24-.alpha.-olefin and 30-70%by weight of ethylene, and a copolymer (B) made from 10-90% by weight of C6-C24-.alpha.-olefin and 10-90% by weight of N-C6-C12-alkylmaleiimide, the mixing ratio of copoly-mers (A1) or (A2) to (B) being 100:1 to 1:1. These polymer mixtures are employed as flow improvers in mineral oil distillates.

Thermoplastic resin composition

Abstract: PURPOSE:To obtain the titled composition capable of giving molded products of improved surface properties without impairing processability and mechanical properties, by blending specified proportion of each specific thermoplastic resin and ethylene-vinyl acetate copolymer saponified product with both ash and alkali metal contents significantly reduced. CONSTITUTION:The objective composition can be obtained by blending (A) a thermoplastic resin with a melting point 160-270 deg.C with its main chain constituted of both carbon and oxygen atoms (e.g., polycarbonate, polyethylene terephthalate) and (B) an ethylene-vinyl acetate copolymer saponified product with an ethylene content 20-60mol%, the saponification degree of the vinyl acetate domain >=95%, ash content <=20(pref. <=10)ppm and alkali metal content <=5(pref. <=3)ppm in the weight ratio A/B=99/1-80/20 (pref., 95/5-85/15).

Aqueous polymer compositions and methods for their preparation

Abstract: An aqueous dispersion comprising a polyester having repeat units from at least one difunctional sulfomonomer containing at least one metal sulfonate group attached to an aromatic nucleus wherein the functional groups are carboxyl or hydroxyl, and a polymer having a majority of repeat units from vinyl acetate, wherein this polymer is formed from monomers polymerized in an aqueous dispersion of said polyesters.

Shine hair conditioner

Abstract: A stable shine hair conditioner formulation which provides shiny, smooth, manageable hair, easy to comb, easy to style, long holding power and is cost effective consisting essentially of effective amounts of C14 -C22 alkyl trimethyl quaternary ammonium compound, mineral oil or glyceryl monostearate, a C14 -C22 alkanol, a cellulose polymer, a copolymer of polyvinylpyrrolidone and vinyl acetate (PVP/VA) and a plasticizer selected from the group consisting of lanolin acetate, propylene glycol, glycerine, and water soluble lanolin, in an aqueous vehicle.

Hot melt adhesive composition

Abstract: PURPOSE: To obtain a hot-melt adhesive composition for more readily bonding a plastics such as polypropylene, polyethylene, etc., than a conventional ethylene- vinyl acetate copolymer(EVA) adhesive not containing an amorphous polyolefin, having ≥3kgf/25mm bond strength at a normal temperature and 1.5kg/25mm even at 40°C in the case of a polypropylene film as a material to be bonded. CONSTITUTION: This hot-melt adhesive composition comprises (a) 100 pts.wt. of an ethylene-vinyl acetate copolymer having ≤25wt.% vinyl acetate content and ≥2 melt flow rate, (b) 1-150 pts.wt. of an amorphous polyolefin having 1,000-20,000 number-average molecular weight, 50-100,000cps melt viscosity at 190°C and ≥30wt.% of a propylene component, (c) 50-300 pts.wt. of a tackifier and (d) 0-100 pts.wt. of a wax. COPYRIGHT: (C)1996,JPO

Gypsum scale inhibitors for flue gas desulfurization systems

Abstract: Gypsum scale inhibitors useful under wet flue gas desulfurization (FGD) scrubber temperature and pH conditions. The gypsum inhibitors advantageously prevent or minimize gypsum scale formation and crystal growth in mist eliminator wash water and in the scrubber internals. Specific inhibitors contemplated include copolymers of modified acrylic acid/acrylamide; acrylic acid/vinyl acetate; acrylic acid/maleic anhydride; acrylic acid/acrylate ester; and combinations thereof. In addition, gypsum scale inhibitors comprising phosphonate-polymer blends of hexamethylene diamine tetra (methylene phosphonic acid) salts and polymaleate, poly(acrylic acid/ethylacrylate), poly(acrylic acid/N-methoxypropyl acrylamide/acrylamide), poly(acrylic acid/N-propyl acrylamide/acrylamide), and combinations thereof are also contemplated.

Specified C14-carboxylate/vinyl ester polymer-containing compositions for lubricating oil flow improvement

Abstract: Compositions are disclosed for improving at least the low temperature flow properties of lubricating oils. The compositions are dual additives including a first component which is a polymer or interpolymer of a C₁₄ carboxylate, such as a C₁₄-dialkyl fumarate/vinyl acetate interpolymer, and a second component which is a lubricating oil flow improver comprising a non-ethylene containing polymer or interpolymer such as dialkyl fumarate/vinyl acetate interpolymer, esterified styrene/maleic anhydride interpolymer, or esterified olefin/maleic anhydride interpolymer.

Polymer composition, its heat resistant, shape memory formed product and method of producing same

Abstract: A heat-resistant formed product produced from a polymer composition comprising 40-70 weight % of a thermoplastic elastomer containing a repeating unit derived from ethylene and a repeating unit derived from propylene and 60-30 weight % of an ethylene-vinyl acetate copolymer containing 7.5 weight % or more of a vinyl acetate repeating unit, by blending the polymer composition at a temperature of 160°C or less, molding it at a temperature of 180°C or less, and then cross-linking the resulting molded product by irradiating electron beam or heating. The formed product also has good shape memory characteristics.

Hydrophilic microporous membrane and process for preparing same

Abstract: A hollow fiber microporous membrane of a polyolefin having a polyvinyl alcohol chemically bonded to the inner and outer surfaces of the hollow fiber membrane and the surfaces defining the pores thereof exhibits a good hydrophilic property as well as good chemical resistance, mechanical strength, water permeation performance and durability. This membrane has an average pore diameter of 0.01 to 5 µm and a porosity of 20 to 80%. The polyvinyl alcohol/polyolefin composition ratio is constant in the membrane thickness direction of the hollow fiber, the oxygen/carbon atomic ratio X on the outer surface of the hollow fiber microporous membrane is 10 to 50%, and the condition defined by the ratio X/2 ≧ Y is satisfied between said oxygen/­carbon atomic ratio X and the oxygen/carbon atomic ratio Y in the entire microporous membrane. The membrane is prepared by irradiating a hollow fiber microporous membrane of a polyolefin with ionizing radiations, reacting the membrane with vinyl acetate and then hydrolyzing the membrane.

Multtphase Materials with Lignin. III. Polyblends with Ethylene-Vinyl Acetate Copolymers

Abstract: Organosolv lignin (OSL) from red oak, and its corresponding hydroxypropyl lignin (HPL) derivative, were blended in the melt with polyethylene and with ethylene-vinyl acetate (EVA) copolymer, and injection molded. Lignin (derivative) content and vinyl acetate (VA) content both served as process variables. All mixtures produced immiscible blends, both by scanning electron microscopy and dynamic mechanical analysis. However, the compatibility of the two polymers increased with VA content. Both lignin products proved to be effective modulus builders, but. HPI, was more effective than OSL at VA contents above 20%. Modulus increased roughly in accordance with the rule of mixing. Inferior tensile strength properties were observed with the EVA copolymer if VA content was below 10%, and superior characteristics were noted in materials containing more than 25% VA and between 5 and 20% HPL.

Cathode coating dispersion for batteries

Abstract: A cathode coating dispersion containing graphite and/or carbon black, which is suitable for battery production, especially for a water-resistant and alkali-resistant and yet electrically conductive coating of the cathode surfaces. The protective film is applied as a homogeneous aqueous dispersion and contains a binder which is a copolymer of (a) vinyl acetate and ethylene, (b) vinyl acetate and vinyl chloride, (c) styrene and butadiene or (d) vinyl acetate, vinyl chloride and ethylene.

Blend of polyvinyl chloride, chlorinated or chlorosulfonated polyethylene and ethylene-containing terpolymer

Abstract: A polymer composition comprising (a) 35-65 parts by weight polyvinyl chloride, (b) 10-55 parts by weight chlorinated polyethylene or chlorosulfonated polyethylene elastomer or mixtures thereof containing 24-40 weight percent chlorine, (c) 10-55 parts by weight of a chlorinated polyethylene or chlorosulfonated polyethylene elastomer or mixtures thereof containing 40-52 weight percent chlorine with the proviso that the chlorine level of the elastomers (b) and (c) differ by at least 5 weight percent, and (d) 1-30 parts by weight per 100 parts by weight of total chlorinated polymers (a), (b) and (c) of an ethylene terpolymer containing 48-74 weight percent ethylene, 20-40 weight percent vinyl acetate or alkyl acrylate wherein the alkyl group contains 1-10 carbon atoms, and 6-14 weight percent carbon monoxide. Such compositions are useful as pond liners, roofing membranes, wire and cable covering, and window profiles.