US4433069A — Method for preparing flame resistant polysiloxane…

Claim 1

Independent Claim 122 words

A cured, flame retardant polyorganosiloxane in the form of a blown foam containing (1) at least five parts by weight per million parts by weight of said foam of platinum in elemental or chemically combined form, said foam having uniformly dispersed therein (2) at least 0.1%, based on the weight of said foam, of at least one finely divided nonmetallic, fibrous heat resistant material, and (3) at least 0.1%, based on the weight of said foam, of at least one finely divided nonmetallic, cellular heat resistant material, wherein the combined concentrations of fibrous and cellular heat resistant materials do not exceed 40% of the total weight of said foam and the heat resistant materials do not soften or decompose below 1500° C.

Claim 2

Dependent Claim 122 words

A cured, flame retardant polyorganosiloxane in the form of a blown foam containing (1) at least five parts by weight per million parts by weight of said foam of platinum in elemental or chemically combined form, said foam having uniformly dispersed therein (2) at least 0.1%, based on the weight of said foam, of at least one finely divided nonmetallic, fibrous heat resistant material, and (3) at least 0.1%, based on the weight of said foam, of at least one finely divided nonmetallic, cellular heat resistant material, wherein the combined concentrations of fibrous and cellular heat resistant materials do not exceed 40% of the total weight of said foam and the heat resistant materials do not soften or decompose below 1500° C.

Claim 3

Dependent Claim 22 words

A polyorganosiloxane according to claim 1 where components (2) and (3) each constitute from 0.1 to 20% by weight of said foam.

Claim 4

Dependent Claim 22 words

A polyorganosiloxane according to claim 2 where components (2) and (3) each constitute from 1 to 10% by weight of said foam.

Claim 5

Dependent Claim 44 words

A polyorganosiloxane according to claim 1 where component (2) is at least one member selected from the group consisting of glass, carbon, silicon carbide, silicon nitride, zircon, the alkali metal titanates, boron carbide, and silicates and oxides of zirconium, aluminum, chromium, magnesium, and calcium.

Claim 6

Dependent Claim 19 words

A polyorganosiloxane according to claim 4 where component (2) is selected from the group consisting of glass and carbon.

Claim 7

Dependent Claim 26 words

A polyorganosiloxane according to claim 1 where component (3) is at least one member selected from the group consisting of hollow glass microspheres, perlite, and vermiculite.

Claim 8

Dependent Claim 24 words

A polyorganosiloxane according to claim 1 where said matrix further comprises at least one uniformly dispersed finely divided filler other than (2) and (3).

Claim 9

Dependent Claim 27 words

A polyorganosiloxane according to claim 7 where said filler is at least one member selected from the group consisting of ground quartz, carbon black, and zinc oxide.

Claim 10

Dependent Claim 173 words

A polyorganosiloxane according to claim 1 where said blown foam is a reaction product of a room temperature foamable and curable composition comprising (A) at least one organohydrogensiloxane containing at least three silicon-bonded hydrogen atoms per molecule and an average of no more than one hydrogen atom per silicon atom, (B) at least one hydroxyl compound selected from the group consisting of silanols, siloxanols, and water, and (C) at least one polydiorganosiloxane selected from the group consisting of hydroxyl-containing polydiorganosiloxanes and triorganopolysiloxy-endblocked polydiorganosiloxanes containing at least two silicon-bonded vinyl groups per molecule, the concentration of said polydiorganosiloxanes being sufficient to impart a viscosity to said foamable and curable composition of from 0.1 to 100 Pa·s, measured at 25° C., wherein the organic groups bonded to the silicon atoms of the organohydrogensiloxane, polydiorganosiloxane, silanol, and siloxanol are selected from the group consisting of alkyl containing from 1 to 6 carbon atoms, cycloalkyl containing from 3 to 6 carbon atoms, vinyl, phenyl, and 3,3,3-trifluoropropyl, and any hydroxyl-containing polydiorganosiloxane constitutes at least a portion of (B).

Claim 11

Dependent Claim 39 words

A polyorganosiloxane according to claim 9 where said organic groups are selected from the group consisting of methyl, vinyl, phenyl, and 3,3,3-trifluoropropyl and the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl groups is from 2.5 to 40.

Claim 12

Dependent Claim 14 words

A polyorganosiloxane according to claim 10 where said organic groups are methyl and vinyl.

Claim 13

Dependent Claim 41 words

A polyorganosiloxane according to claim 10 where said hydroxyl compound is at least one member selected from the group consisting of silanol and siloxanols and the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl groups is from 4 to 10.

Claim 14

Dependent Claim 54 words

A polyorganosiloxane according to claim 9 where the foamable and curable composition comprises a silanol or siloxanol as the hydroxyl compound and a triorganosiloxy-endblocked polydiorganosiloxane containing an average of at least two silicon-bonded vinyl groups per molecule and the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl groups is from 0.5 to 40.

Claim 15

Dependent Claim 34 words

A polyorganosiloxane according to claim 13 where said triorganosiloxy-endblocked polydiorganosiloxane is diorganovinylsiloxy terminated and is present at a concentration of up to 50%, based on the total weight of the triorganosiloxy-terminated polydiorganosiloxane and organohydrogensiloxane.

Claim 16

Dependent Claim 72 words

A polyorganosiloxane according to claim 9 where the organohydrogensiloxane is a polymethylhydrogensiloxane, the polydiorganosiloxane component includes at least one hydroxyl-terminated polydimethylsiloxane and at least one dimethylvinylsiloxy-endblocked polydimethylsiloxane, component (2) is glass or carbon, component (3) is glass microspheres or perlite, and the foamable and curable composition further comprises at least one finely divided filler other than (2) and (3) selected from the group consisting of carbon black, ground quartz, and zinc oxide.

Claim 17

Independent Claim 315 words

A method for preparing a flame retardant room temperature curable polyorganosiloxane foam comprising (I) forming a homogeneous reactive composition by blending together (A) at least one organohydrogensiloxane containing at least three silicon-bonded hydrogen atoms per molecule and an average of no more than one hydrogen atom per silicon atom, (B) at least one hydroxyl compound selected from the group consisting of silanols, siloxanols, and water, (C) at least one polydiorganosiloxane selected from the group consisting of hydroxyl-containing polydiorganosiloxanes and triorganosiloxy-endblocked polydiorganosiloxanes containing an average of at least two silicon-bonded vinyl groups per molecule, the concentration of said polydiorganosiloxane being such that the viscosity of the reactive composition is within the range of from 0.1 to 100 Pa·s, measured at 25° C., wherein the organic groups bonded to the silicon atoms of the organohydrogensiloxane, silanol, siloxanol, and polydiorganosiloxane are selected from the group consisting of alkyl containing from 1 to 6 carbon atoms, cycloalkyl containing from 3 to 6 carbon atoms, vinyl, phenyl, and 3,3,3-trifluoropropyl, and any hydroxy-containing polydiorganosiloxane constitutes at least a portion of (B). (1) at least five parts by weight per million parts by weight of said reactive composition of platinum in elemental or chemically combined form, (2) at least 0.1%, based on the weight of said reactive composition of at least one finely divided nonmetallic, fibrous heat resistant material, and (3) at least 0.1%, based on the weight of said reactive composition, of at least one finely divided nonmetallic, cellular, heat resistant material, wherein the combined concentrations of fibrous and cellular heat resistant materials do not exceed 40% of the total weight of said reactive composition, and said heat resistant materials do not soften or decompose below 1500° C., and (II) allowing said reactive composition to form a cured polyorganosiloxane foam exhibiting an increased resistance to burn-through relative to polyorganosiloxane foams prepared using either a fibrous or a cellular heat resistant material.

Claim 18

Independent Claim 315 words

A method for preparing a flame retardant room temperature curable polyorganosiloxane foam comprising (I) forming a homogeneous reactive composition by blending together (A) at least one organohydrogensiloxane containing at least three silicon-bonded hydrogen atoms per molecule and an average of no more than one hydrogen atom per silicon atom, (B) at least one hydroxyl compound selected from the group consisting of silanols, siloxanols, and water, (C) at least one polydiorganosiloxane selected from the group consisting of hydroxyl-containing polydiorganosiloxanes and triorganosiloxy-endblocked polydiorganosiloxanes containing an average of at least two silicon-bonded vinyl groups per molecule, the concentration of said polydiorganosiloxane being such that the viscosity of the reactive composition is within the range of from 0.1 to 100 Pa·s, measured at 25° C., wherein the organic groups bonded to the silicon atoms of the organohydrogensiloxane, silanol, siloxanol, and polydiorganosiloxane are selected from the group consisting of alkyl containing from 1 to 6 carbon atoms, cycloalkyl containing from 3 to 6 carbon atoms, vinyl, phenyl, and 3,3,3-trifluoropropyl, and any hydroxy-containing polydiorganosiloxane constitutes at least a portion of (B). (1) at least five parts by weight per million parts by weight of said reactive composition of platinum in elemental or chemically combined form, (2) at least 0.1%, based on the weight of said reactive composition of at least one finely divided nonmetallic, fibrous heat resistant material, and (3) at least 0.1%, based on the weight of said reactive composition, of at least one finely divided nonmetallic, cellular, heat resistant material, wherein the combined concentrations of fibrous and cellular heat resistant materials do not exceed 40% of the total weight of said reactive composition, and said heat resistant materials do not soften or decompose below 1500° C., and (II) allowing said reactive composition to form a cured polyorganosiloxane foam exhibiting an increased resistance to burn-through relative to polyorganosiloxane foams prepared using either a fibrous or a cellular heat resistant material.

Claim 19

Dependent Claim 23 words

A method according to claim 16 where components (2) and (3) each constitute from 0.1 to 20% by weight of the reactive composition.

Claim 20

Dependent Claim 23 words

A method according to claim 17 where components (2) and (3) each constitute from 1 to 10% by weight of the reactive composition.

Claim 21

Dependent Claim 45 words

A method according to claim 16 where component (2) is at least one member selected from the group consisting of glass, carbon, silicon carbide, silicon nitride, zircon, the alkali metal titanates, boron carbide, and the silicates and oxides of zirconium, aluminum, chromium, magnesium, and calcium.

Claim 22

Dependent Claim 13 words

A method according to claim 19 where component (2) is glass or carbon.

Claim 23

Dependent Claim 29 words

A method according to claim 16 where said cellular heat resistant material comprises at least one member selected from the group consisting of hollow glass microspheres, perlite, and vermiculite.

Claim 24

Dependent Claim 25 words

A method according to claim 16 where the reactive composition further comprises at least one uniformly dispersed finely divided filler other than (2) or (3).

Claim 25

Dependent Claim 29 words

A method according to claim 22 where said finely divided filler is at least one member selected from the group consisting of ground quartz, carbon black, and zinc oxide.

Claim 26

Dependent Claim 39 words

A method according to claim 16 where said organic groups are selected from the group consisting of methyl, vinyl, phenyl, and 3,3,3-trifluoropropyl and the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl groups is from 2.5 to 40.

Claim 27

Dependent Claim 14 words

A method according to claim 24 where said organic groups are methyl and vinyl.

Claim 28

Dependent Claim 41 words

A method according to claim 16 where said hydroxyl compound is at least one member selected from the group consisting of silanols and siloxanols and the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl groups is from 4 to 10.

Claim 29

Dependent Claim 52 words

A method according to claim 26 where the reactive composition comprises a silanol or siloxanol as the hydroxyl compound and a triorganosiloxy-endblocked polydiorganosiloxane containing an average of at least two silicon-bonded vinyl groups per molecule and the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl groups is from 0.5 to 40.

Claim 30

Dependent Claim 35 words

A method according to claim 27 where said triorganosiloxy end-blocked polydiorganosiloxane is diorganovinylsiloxy terminated and is present at a concentration of up to 50%, based on the total weight of the triorganosiloxy-terminated polydiorganosiloxane and organohydrogensiloxane.

Claim 31

Dependent Claim 74 words

A method according to claim 16 where the organohydrogensiloxane is a polymethylhydrogensiloxane, the polydiorganosiloxane component includes at least one hydroxyl-terminated polydimethylsiloxane and at least one dimethylvinylsiloxy-endblocked polydimethylsiloxane, resistant material is glass or carbon, the cellular heat resistant material is hollow glass microspheres or perlite, and the reactive composition employed to prepare the foam further comprises at least one finely divided filler selected from the group consisting of carbon black, ground quartz, and zinc oxide.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-02-20	1987-08-22	1988-02-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-02-20	1991-08-22	1992-02-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-02-20	1995-08-22	1996-02-21	$7700.00	Window Closed / Lapsed

Method for preparing flame resistant polysiloxane foams and foams prepared thereby

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag