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US 12,454,125 B2Granted
Method for preparation of a laminate article including a silicone pressure sensitive adhesive adhered to silicone rubber
AssigneeDow Silicones Corporation
InventorsBinbin Luo, Timothy Mitchell
Life of this patent
Estimating the term…
Abstract
A laminate article includes a silicone pressure sensitive adhesive adhered to a silicone rubber article. A method for fabricating the laminate article is provided.
Claims20
A method for fabricating a laminate article, the method comprising:
- (1) combining, under conditions to effect condensation reaction, starting materials comprising
- (P) a bis-hydroxyl-terminated polydiorganosiloxane with a weight average molecular weight of 10,000 g/mol to <200,000 g/mol measured by GPC, where starting material (P) is present in an amount of >20.5 weight % based on combined weights of starting materials (P) and (R);
- (R) a hydroxyl-functional polyorganosilicate resin with a weight average molecular weight of 15,000 g/mol to 30,000 g/mol measured by GPC, where starting material (R) is present in an amount <79.5 weight %, based on combined weights of starting materials (P) and (R);
- (S) a solvent;
- and
- optionally (N) a neutralizer;
- where
- starting materials (R) and (P) and are present in a weight ratio (R)/(P) of 0.65/1 to <3.0/1;
- thereby producing a reaction mixture;
- and
- (2) adding (C) a condensation reaction catalyst to the reaction mixture, thereby producing a catalyzed reaction mixture;
- (3) mixing the catalyzed reaction mixture at a temperature of 20° C. to 150° C. and removing water, thereby forming a reaction product comprising a condensation reaction product of (P) and (R);
- optionally (4) recovering the condensation reaction product of (P) and (R);
- (5) adding, to the condensation reaction product, (R′) an additional polyorganosilicate resin with a weight average molecular weight of 5,500 g/mol to 30,000 g/mol measured by GPC in an amount sufficient to provide a (Rtot)/(P) ratio to 2.27/1 to <3.88/1 where Rtot represents a sum of amount of (R′) and amount of (R) from step (1) and with the proviso that (Rtot)/(P)>(R)/(P);
- optionally (6) adding up to 4 weight %, based on combined weights of (R), (R′), and (P), of (X) a peroxide crosslinking agent, thereby forming a silicone pressure sensitive adhesive composition;
- optionally (7) treating a surface of a backing substrate;
- (8) coating the silicone pressure sensitive adhesive composition on the surface of the backing substrate;
- (9) drying the silicone pressure sensitive adhesive composition;
- (10) curing the silicone pressure sensitive adhesive composition to form a silicone pressure sensitive adhesive layer having a surface adhered to the surface of the backing substrate, where the silicone pressure sensitive adhesive layer further comprises an opposing surface opposite the surface of the backing substrate;
- optionally (11) treating a surface of a silicone rubber article;
- and
- (12) adhering the opposing surface of the silicone pressure sensitive adhesive and the surface of the silicone rubber article.
19 more elements
A method for fabricating a laminate article, the method comprising:
- (1) combining, under conditions to effect condensation reaction, starting materials comprising
- (P) a bis-hydroxyl-terminated polydiorganosiloxane with a weight average molecular weight of 10,000 g/mol to <200,000 g/mol measured by GPC, where starting material (P) is present in an amount of >20.5 weight % based on combined weights of starting materials (P) and (R);
- (R) a hydroxyl-functional polyorganosilicate resin with a weight average molecular weight of 15,000 g/mol to 30,000 g/mol measured by GPC, where starting material (R) is present in an amount <79.5 weight %, based on combined weights of starting materials (P) and (R);
- (S) a solvent;
- and
- optionally (N) a neutralizer;
- where
- starting materials (R) and (P) and are present in a weight ratio (R)/(P) of 0.65/1 to <3.0/1;
- thereby producing a reaction mixture;
- and
- (2) adding (C) a condensation reaction catalyst to the reaction mixture, thereby producing a catalyzed reaction mixture;
- (3) mixing the catalyzed reaction mixture at a temperature of 20° C. to 150° C. and removing water;
- thereby forming a reaction product comprising a condensation reaction product of (P) and (R);
- optionally (4) recovering the condensation reaction product of (P) and (R);
- (5) adding, to the condensation reaction product, (R′) an additional polyorganosilicate resin with a weight average molecular weight of 5,500 g/mol to 30,000 g/mol measured by GPC in an amount sufficient to provide a (Rtot)/(P) ratio to 2.27/1 to <3.88/1 where Rtot represents a sum of amount of (R′) and amount of (R) from step (1) and with the proviso that (Rtot)/(P)>(R)/(P);
- optionally (6) adding up to 4 weight %, based on combined weights of (R) and (P), of (X) a peroxide crosslinking agent, thereby forming a silicone pressure sensitive adhesive composition;
- optionally (7) treating a surface of a backing substrate comprising a silicone rubber;
- (8) coating the silicone pressure sensitive adhesive composition on the surface of the backing substrate;
- (9) drying the silicone pressure sensitive adhesive composition,
- (10) curing the silicone pressure sensitive adhesive composition to form a silicone pressure sensitive adhesive layer having a surface adhered to the surface of the backing substrate, where the silicone pressure sensitive adhesive layer further comprises an opposing surface opposite the surface of the backing substrate;
- optionally (10) treating a surface of a silicone rubber article;
- and
- optionally (11) adhering the opposing surface of silicone pressure sensitive adhesive layer and the surface of the silicone rubber article.
20 more elements
Dependencies are inferred from the claim text.