Loctite

About: Loctite is a based out in . It is known for research contribution in the topics: Adhesive & Curing (chemistry). The organization has 343 authors who have published 390 publications receiving 7718 citations.

The single-fibre pull-out test. 1: Review and interpretation

Abstract: For the first time, the load versus extension trace generated by the single-fibre pull-out test is thoroughly interpreted and mathematically modelled. The single-fibre pull-out test is employed experimentally to model the failure of fibre-reinforced composite materials. The interpretation of this model, however, varies between laboratories. In this paper, the test methodologies and the experimental and mathematical interpretations of various scientists are presented and discussed, as is some preliminary work employing optical fibres embedded in various neat resins. Also, a more complete description of the experimental events is presented and described mathematically via the critical strain energy release rate for crack initiation and propagation, the interfacial shear stress of the bond and the coefficient of friction.

Polysiloxane urethane compounds and adhesive compositions, and method of making and using the same

Abstract: Silicone urethane compounds, e.g., a polysiloxane urethane (meth)acrylate, obtained as a reaction product of a polysiloxane carbinol, a polyisocyanate, and a polyfunctional compound having at least one functional group which is reactive with an isocyanate group of the polyisocyanate and after reaction therewith provides an ethylenic functional group in the reaction product. The polysiloxane carbinol has a molecular weight of from about 5,000 to about 50,000 and has R'OH end groups wherein R' is linear C 4 -C 20 alkylene. Such carbinol may be obtained as a reaction product of the corresponding hydride-terminated polysiloxane and a linear C 4 -C 20 ω-alkenyl alcohol. The hydride-terminated polysiloxane in turn may be obtained as a reaction product of either (i) the corresponding silanol of molecular weight at least 10,000 and a hydridosilane having one or more hydrolyzable groups attached to the silicon atom, or (ii) a cyclosiloxane and a 1,3-dihydrido disiloxane. The disclosed compounds may be utilized in adhesive compositions for substrates including bonding surfaces such as glass, and polymers and copolymers of ethylenically unsaturated monomers. The bonding of such substrates may suitably be carried out at least partially under anoxic conditions, e.g., with elevated temperature and/or actinic radiation curing of the bonding composition in a substantially oxygen-free environment. A preferred vacuum degassing/anoxic curing process is disclosed for such bonding compositions, which is particularly advantageous for difficult to bond substrates, such as low density polyethylene.

Uv curable silicone rubber compositions

Abstract: Compositions of (a) a silicone resin characterized by an intermediate region free of acrylic groups, at least 150 siloxane units long, and terminal acrylic groups; (b) at least 10% of a fumed silica filler; and (c) a photoinitiator, can be cured by UV irradiation to tough elastomeric materials useful in adhesive and sealant applications.

Dual curing silicone, method of preparing same and dielectric soft-gel compositions thereof

Abstract: Novel dual curing silicones are terminated with acrylic functional dialkoxy or diaryloxy silyl groups. They are prepared by condensation of a silanol terminated silicone with a silane represented by the formula ##STR1## where R 3 is alkyl or aryl, R 4 is H or C 1-5 alkyl and R 5 is alkylene, the ratio of silane to silanol silicone being between about 2.1 and 6.1. Compositions of the novel silicones with moisture cure catalysts, photoinitiators and optionally up to 70% trimethyl silyl terminated silicone oils, are both moisture and UV curable and produce soft gel or rubbery cured materials suitable for electronic potting applications.