US4247445A — Paintable one-component RTV systems

Claim 1

Independent Claim 135 words

A paintable one-component room temperature vulcanizable silicone rubber composition comprising (A) 100 parts by weight of a silanol end-stopped diorganopolysiloxane polymer where the organo groups are monovalent hydrocarbon radicals and the polymer has a viscosity that varies from 50 to 1,000,000 centipoise at 25° C.; (B) from 200 to 500 parts by weight of calcium carbonate; (C) from 1 to 10 parts by weight of a cross-linking agent of the formula, ##STR5## where R is a monovalent hydrocarbon radical of 1 to 8 carbon atoms and R 1 is a monovalent hydrocarbon radical of 5 to 30 carbon atoms and m is 0 or 1; and (D) from 0.01 to 5 parts by weight of a curing catalyst comprising an organic tin salt of an organic acid or a tin salt of an organic acid.

Claim 2

Dependent Claim 135 words

A paintable one-component room temperature vulcanizable silicone rubber composition comprising (A) 100 parts by weight of a silanol end-stopped diorganopolysiloxane polymer where the organo groups are monovalent hydrocarbon radicals and the polymer has a viscosity that varies from 50 to 1,000,000 centipoise at 25° C.; (B) from 200 to 500 parts by weight of calcium carbonate; (C) from 1 to 10 parts by weight of a cross-linking agent of the formula, ##STR5## where R is a monovalent hydrocarbon radical of 1 to 8 carbon atoms and R 1 is a monovalent hydrocarbon radical of 5 to 30 carbon atoms and m is 0 or 1; and (D) from 0.01 to 5 parts by weight of a curing catalyst comprising an organic tin salt of an organic acid or a tin salt of an organic acid.

Claim 3

Dependent Claim 53 words

The composition of claim 1 where in (A) the silanol end-stopped diorganopolysiloxane has the formula, ##STR6## wherein R 2 and R 3 may be the same or different and are monovalent hydrocarbon radicals and t varies such that the polymer has a viscosity that varies from 50 to 1,000,000 centipoise at 25° C.

Claim 4

Dependent Claim 21 words

The composition of claim 1 which further contains from 4 to 28 parts by weight of fumed silica treated with octamethylcyclotetrasiloxane.

Claim 5

Dependent Claim 23 words

The composition of claim 3 which further contains from 0.03 to 2.0 parts by weight of a polyether as a sag control additive.

Claim 6

Dependent Claim 22 words

The composition of claim 4 which further contains from 0.2 to 4 parts by weight of a silylisocyanurate as an adhesion promoter.

Claim 7

Dependent Claim 38 words

The composition of claim 5 wherein the composition further contains from 1 to 50 parts by weight of a triorganosilyl end-stopped diorganopolysiloxane polymer having from 10 to 5,000 centipoise viscosity where said organo groups are monovalent hydrocarbon radicals.

Claim 8

Dependent Claim 86 words

The composition of claim 6 which further contains from 2 to 20 parts by weight of a fluid polysiloxane containing a high degree of trifunctionality or a mixture of tri-or tetrafunctionality and comprising (i) from 25 to 60 mole percent of monoalkylsiloxy units, siloxy units or a mixture of such units; (ii) from 1 to 6 mole percent of trialkylsiloxy units; and (iii) from 34 to 74 mole percent of dialkylsiloxy units, said polysiloxane containing from about 0.1 to 2 percent by weight of silanol groups.

Claim 9

Dependent Claim 11 words

The composition of claim 7 wherein (C) is methyl tris (2-ethylhexanoxy)silane.

Claim 10

Dependent Claim 11 words

The composition of claim 7 wherein (C) is methyl trisbenzoxy silane.

Claim 11

Dependent Claim 23 words

The composition of claim 8 wherein (D) is an organic tin salt of an organic acid containing from 2 to 6 carbon atoms.

Claim 12

Dependent Claim 11 words

The composition of claim 10 wherein (D) is dibutyl tin diacetate.

Claim 13

Dependent Claim 153 words

A process for forming a paintable one-component room temperature vulcanizable silicone rubber composition comprising (i) mixing with low shear (A) 100 parts by weight of a silanol end-stopped diorganopolysiloxane polymer where the organo groups are monovalent hydrocarbon radicals and the polymer has a viscosity that varies from 50 to 1,000,000 centipoise at 25° C.; (B) from 200 to 500 parts by weight of calcium carbonate; (C) from 1 to 10 parts by weight of a cross-linking agent of the formula, ##STR7## where R is a monovalent hydrocarbon radical of 1 to 8 carbon atoms and R 1 is a monovalent hydrocarbon radical of 5 to 30 carbon atoms and m is 0 or 1; and (D) from 0.01 to 5 parts by weight of a curing catalyst comprising an organic tin salt of an organic acid or a tin salt of an organic acid; (ii) allowing the composition to cure at room temperature.

Claim 14

Dependent Claim 153 words

A process for forming a paintable one-component room temperature vulcanizable silicone rubber composition comprising (i) mixing with low shear (A) 100 parts by weight of a silanol end-stopped diorganopolysiloxane polymer where the organo groups are monovalent hydrocarbon radicals and the polymer has a viscosity that varies from 50 to 1,000,000 centipoise at 25° C.; (B) from 200 to 500 parts by weight of calcium carbonate; (C) from 1 to 10 parts by weight of a cross-linking agent of the formula, ##STR7## where R is a monovalent hydrocarbon radical of 1 to 8 carbon atoms and R 1 is a monovalent hydrocarbon radical of 5 to 30 carbon atoms and m is 0 or 1; and (D) from 0.01 to 5 parts by weight of a curing catalyst comprising an organic tin salt of an organic acid or a tin salt of an organic acid; (ii) allowing the composition to cure at room temperature.

Claim 15

Dependent Claim 53 words

The process of claim 12 wherein (A) the silanol end-stopped diorganopolysiloxane polymer has the formula, ##STR8## wherein R 2 and R 3 may be the same or different and are monovalent hydrocarbon radicals and t varies such that the polymer has a viscosity that varies from 50 to 1,000,000 centipoise at 25° C.

Claim 16

Dependent Claim 21 words

The process of claim 12 which further contains from 4 to 18 parts by weight of fumed silica treated with octamethylcyclotetrasiloxane.

Claim 17

Dependent Claim 23 words

The process of claim 14 which further contains from 0.03 to 2.0 parts by weight of a polyether as a sag control additive.

Claim 18

Dependent Claim 25 words

The process of claim 15 wherein (i) the mixture further contains from 0.2 to 4 parts by weight of a silylisocyanurate as an adhesion promoter.

Claim 19

Dependent Claim 38 words

The process of claim 16 wherein the composition further contains from 1 to 60 parts by weight of a triorganosilyl end-stopped diorganopolysiloxane polymer having from 10 to 5,000 centipoise viscosity where such organo groups are monovalent hydrocarbon radicals.

Claim 20

Dependent Claim 87 words

The process of claim 17 which further contains from 2 to 20 parts by weight of a fluid polysiloxane containing a high degree of trifunctionality or a mixture of tri- or tetrafunctionality and comprising (i) from 5 to 60 mole percent of monoalkylsiloxy units, siloxy units or a mixture of such units; (ii) from 1 to 6 mole percent of trialkylsiloxy units; and (iii) from 34 to 94 mole percent of dialkylsiloxy units, said polysiloxane containing from about 0.1 to 2 percent by weight of silanol groups.

Claim 21

Dependent Claim 11 words

The process of claim 18 wherein (C) is methyl tris (2-ethylhexanoxy)silane.

Claim 22

Dependent Claim 11 words

The process of claim 18 wherein (C) is methyl trisbenzoxy silane.

Claim 23

Dependent Claim 23 words

The process of claim 19 wherein (D) is an organic tin salt of an organic acid containing from 2 to 6 carbon atoms.

Claim 24

Dependent Claim 11 words

The process of claim 21 wherein (D) is dibutyl tin diacetate.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-01-27	1984-07-28	1985-01-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-01-27	1988-07-28	1989-01-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-01-27	1992-07-28	1993-01-27	$7700.00	Window Closed / Lapsed

Paintable one-component RTV systems

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