A drive mechanism for an endoscopic surgical instrument which has a rotatable drive shaft and a mechanism for translating the rotational force of the shaft for applying fasteners to tissue during endoscopic surgery.

Endoscopic instrument having a torsionally stiff drive shaft for applying fasteners to tissue

The present invention provides water based compositions and methods of using the compositions for sealing subterranean zones. The compositions are basically comprised of water, an aqueous rubber latex, an organophillic clay and sodium carbonate.

Water based compositions for sealing subterranean zones and methods

The present invention provides improved methods of sealing a subterranean zone to remedy the uncontrolled flow of fluids into and out of the zone. The methods basically comprise preparing a sealing composition and placing the composition into the zone to be sealed. The placement of the composition is controlled in a manner whereby portions of the sealing composition are continuously converted to sealing masses which are successively diverted into permeable portions of the zone until all of the permeable portions are sealed.

Methods of sealing subterranean zones

The present invention provides improved compositions and methods of using the compositions for sealing subterranean zones. One composition of the invention is comprised of water, an aqueous rubber latex, an organophilic clay, sodium carbonate, an epoxy resin and a hardening agent for said epoxy resin.

Sealing subterranean zones

Disclosed are polyamino alkenyl or alkyl succinimides which have been modified by treatment with a lactone to yield polyamino alkenyl or alkyl succinimides wherein one or more of the basic nitrogens of the polyamino moiety is substituted with a hydrocarbylcarbonylalkylene group. The additives so disclosed are useful as dispersants in lubricating oils, gasolines, marine crankcase oils and hydraulic oils.

Modified succinimides (v)

EPOXY RESIN COMPOSITIONS (D#80,775-F) ABSTRACT OF THE DISCLOSURE An epoxy resin composition comprises an vicinal polyepoxide and a Mannich condensation reaction product curing agent. The curing agent is the Mannich condensation reaction product of a phenol, formaldehyde and a polyoxyethylenediamine of the formula: NH2(CH2CH2O)x-CH2CH2NH2, and wherein: x ranges from 1 to 3. These epoxy resin compositions are useful in coatings, adhesives, encapsulations and composite matrices. RM\80775.app

Epoxy resin compositions

Epoxy resin adhesive compositions comprising a polyepoxide and curative agents can be provided with enhanced flexibility, and the need for solvents is avoided, if the polyepoxide, before curing, is reacted with from 50 to 70 wt. % of a polyoxyalkylene monoamine having a molecular weight of from 900 to 2000, e.g. material having the general formula… CH3O[CH2CH2O]A[CH2CH(CH3)O]BCH2CH(CH3)NH2… in which A is 16-25, and B is 1-5.

One component water reduced epoxy adhesives

A water based epoxy resin composition is disclosed. The epoxy resin is useful in protective coatings. The composition comprises a modified diglycidyl ether of a bisphenol A type epoxy resin with a polyamidopolyamine in aqueous medium. The diglycidyl ether of bisphenol A is modified by partial reaction with a polyoxyalkyleneamine. The polyamidopolyamine is prepared from dimer fatty acids and a polyamine.

Water-based epoxy resin coating composition

An improved curable epoxy resin composition of a vicinalpolyepoxide and an effective amount of a novel polyether urea curing agent is disclosed. The improved curable epoxy resins which are useful as coatings, castings, sealants, and adhesives show improved tensile shear strength, flexural strength, and ultimate elongation. The novel polyether urea curing agents of the instant invention are characterized by terminal primary amino groups and are formed by reaction of polyoxyalkylenepolyamines with urea, urea forming compounds, or bifunctional isocyanates. A preferred curing agent includes a mixture of a novel polyether urea formed by reaction of a polyoxypropylenepolyamine having a molecular weight of from about 200-2000 and an effective amount of urea; and another known epoxy resin curing agent such as a polyoxyalkylenepolyamine in ratios of from about 5:1 to 1:5 by weight.

Polyether urea epoxy curing agent

The adhesion properties of amine-cured epoxy resins are unexpectedly enhanced by addition of certain polyether amide additives. The adhesively superior epoxy resin composition comprises a vicinal polyepoxide, a curing amount of an amine curing agent, and an effective amount of a polyether diamide having terminal amido groups and a molecular weight of from about 2000 to about 3000.

Harold G. Waddill

Papers

Epoxy resin compositions

One component water reduced epoxy adhesives

Water-based epoxy resin coating composition

Polyether urea epoxy curing agent

Polyether diureide epoxy additives