Polysiloxane urethane compounds and adhesive compositions, and m

Details Polysiloxane urethane compounds and adhesive compositions, and m Polysiloxane urethane compounds and adhesive compositions, and m

1986-02-21

1987-08-04

Marquis, Melvyn I.

Coating processes

Electrical product produced

Welding electrode

427 36, 427 35, 427 44, 4284242, 4284248, 428428, 428447, 528 28, B05D 306

Patent

active

046845380

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.sub.4 -C.sub.20 alkylene. Such carbinol may be obtained as a reaction product of the corresponding hydride-terminated polysiloxane and a linear C.sub.4 -C.sub.20 .omega.-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.

REFERENCES:
patent: 4130708 (1978-12-01), Friedlander et al.
patent: 4369300 (1983-01-01), Carter et al.
patent: 4582885 (1986-04-01), Barber
patent: 4605712 (1986-08-01), Muellar et al.
Harasta, L. P. et al, "Radiation-Curable Overcoat Composition and Toner-Imaged Elements Containing Same," Research Disclosure, May, 1983, pp. 188-190.
The American Heritage Dictionary, Second College Edition, p. 89, Houghton Mifflin Co, Boston, 1982.

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