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US 4,309,334 AGranted
Thermally-resistant glass-filled adhesive/sealant compositions
AssigneeLoctite Corporation
InventorRobert A. Valitsky
Life of this patent
Estimating the term…
Abstract
A glass filler comprising a mixture of glass microballoons, glass beads and, optionally, milled glass fibers, preferably in approximate equal proportion by weight, imparts greatly improved thermal cycling resistance to adhesives, such as acrylate-based, ultraviolet curing adhesives.
Claims14
A curable adhesive and sealant composition comprising:
- (a) one or more free radical curable monomers or oligomers;
- (b) an initiator of free radical polymerization;
- (c) a thixotropic agent in sufficient quantity to produce a sufficiently high viscosity to maintain the glass filler mixture in suspension at least for the period of time required for the composition to gel;
- and
- (d) about 5-25% by weight of the total composition of a glass filler mixture consisting essentially of, by weight based on the total glass filler mixture:
- (1) about 5 to about 50% glass microballoons;
- (2) about 10 to about 50% solid glass beads;
- (3) 0 to about 50% milled glass fibers;
- and
- (4) 0 to about 40% glass powder or glass flakes;
- said composition being curable through gaps of at least 5 mils and, when cured, forming a bond or seal which is resistant to destruction by thermal cycling.
8 more elements
An ultraviolet curable adhesive and sealant composition, curable through gaps of at least 5 mils and having, when cured, improved resistance to degradation by thermal cycling, comprising:
- (a) one or more acrylate-terminated, urethane-containing free radical curable monomers or oligomers;
- (b) an ultraviolet initiator of free radical polymerization;
- (c) an acidic accelerator of free radical polymerization;
- (d) a fumed silica thixotropic agent in sufficient quantity to produce a viscosity in the composition of about 5,000 to about 10,000 centipoises;
- and
- (e) about 8-12% by weight of the total composition of a glass filler mixture consisting essentially of, by weight based on the total glass filler mixture:
- (1) about 30-35% glass microballoons;
- (2) about 30-35% solid glass beads;
- and
- (3) about 30-35% milled glass fibers.
7 more elements
Dependencies are inferred from the claim text.