Back to results
US 4,309,508 AGranted
Siloxane copolymer mixtures useful as foam stabilizers in high resilience polyurethane foam
AssigneeUnion Carbide Corporation
InventorsFeyyaz O. Baskent, Bela Prokai
Life of this patent
Estimating the term…
Abstract
Siloxane copolymer mixtures comprising a minor amount of certain high molecular weight (e.g., 4000 to 30,000) siloxane-oxyalkylene copolymers and a major amount of certain low molecular weight (e.g., 300 to 1100) siloxane-oxyalkylene copolymers or cyanoalkylsiloxanes in specifically defined mixture ratios; a process for producing high resilience polyurethane foam utilizing as a foam stabilizer said siloxane copolymer mixtures; and the foams derived therefrom.
Claims11
A siloxane copolymer mixture comprising:
- (1) from about 1 to about 35 weight percent of a high molecular weight siloxane-oxyalkylene copolymer selected from the group consisting of:
- (a) a siloxane-oxyalkylene copolymer having the average formula:
- ##STR8## where Me is methyl, R is an alkylene containing 2 to 4 carbon atoms, x has an average value from about 50 to about 70, y has an average value from about 4 to about 15, m has an average value from about 15 to about 25, and n has an average value from about 15 to about 25;
- and (b) a siloxane-oxyalkylene copolymer having the average formula:
- Bu(OC.sub.2 H.sub.4).sub.d (OC.sub.3 H.sub.6).sub.c O.sub.0.5 [(Me.sub.2 SiO).sub.b (MeSiO.sub.1.5).sub.a ][.sub.0.5 O(C.sub.3 H.sub.6 O).sub.c (C.sub.2 H.sub.4 O).sub.d Bu].sub.a+1
- where Me is methyl, Bu is butyl, a has an average value from 1 to 2, b has an average value from about 12 to about 24, c has an average value from about 10 to about 30, and d has an average value from about 10 to about 40;
- and (2) from about 65 to about 99 weight percent of a low molecular weight siloxane selected from the group consisting of:
- (c) a siloxane-oxyalkylene copolymer having the average formula:
- ##STR9## where Me is methyl, R is an alkylene containing 2 to 4 carbon atoms, o has an average value from about 1 to about 4, p has an average value from about 0.5 to about 3, and e has an average value from about 1 to about 5;
- and (d) a cyanoalkylsiloxane having the average formula:
- ##STR10## where Me is methyl, R' is an alkylene containing 3 to 6 carbon atoms, q has an average value from about 1 to about 4, and r has an average value from about 0.5 to about 4, said weight percents being based on the weights of (1) and (2).
8 more elements
A siloxane copolymer mixture comprising:
- (1) from about 5 to about 20 weight percent of a high molecular weight siloxane-oxyalkylene copolymer having the average composition, ##STR11## wherein Me is methyl, R is an alkylene containing from 2 to 4 carbon atoms, x has an average value from about 50 to about 70, y has an average value from about 4 to about 15, m has an average value from about 15 to about 25, and n has an average value from about 15 to about 25;
- and (2) from about 80 to about 95 weight percent of a low molecular weight siloxane-oxyalkylene copolymer having the average composition, ##STR12## where Me is methyl, R is an alkylene containing from 2 to 4 carbon atoms, o has an average value from about 1 to about 4, p has an average value from about 0.5 to about 3, and e has an average value from about 1 to about 5, said weight percents being based on the weights of (1) and (2).
A siloxane copolymer mixture comprising:
- (1) from about 20 to about 30 weight percent of a high molecular weight siloxane-oxyalkylene copolymer having the average composition, ##STR13## where Me is methyl, R is an alkylene containing from 2 to 4 carbon atoms, x has an average value from about 50 to about 70, y has an average value from about 4 to about 15, m has an average value from about 15 to about 25, and n has an average value from about 15 to about 25;
- and (2) from about 70 to about 80 weight percent of a low molecular weight cyanoalkylsiloxane having the average composition, ##STR14## where Me is methyl, R' is an alkylene containing from 3 to 6 carbon atoms, q has an average value from about 1 to about 4, and r has an average value from about 0.5 to about 4, said weight percents being based on the weights of (1) and (2).
A siloxane copolymer mixture comprising:
- (1) from about 25 to about 35 weight percent of a high molecular weight siloxane-oxyalkylene copolymer having the average composition:
- Bu(OC.sub.2 H.sub.4).sub.d (OC.sub.3 H.sub.6).sub.c O.sub.0.5 [(Me.sub.2 SiO).sub.b (MeSiO.sub.1.5).sub.a ][.sub.0.5 O(C.sub.3 H.sub.6 O).sub.c (C.sub.2 H.sub.4 O).sub.d Bu].sub.a+1
- where Me is methyl, Bu is butyl, a has an average value from 1 to 2, b has an average value from about 12 to about 24, c has an average value from about 10 to about 30, and d has an average value from about 10 to about 40;
- and (2) from about 65 to about 75 weight percent of a low molecular weight siloxane-oxyalkylene copolymer having the average composition, ##STR15## where Me is methyl, R is an alkylene containing 2 to 4 carbon atoms, o has an average value from about 1 to about 4, p has an average value from about 0.5 to about 3, and e has an average value from about 1 to about 5, said weight percents being based on the weights of (1) and (2).
1 more element
A siloxane copolymer mixture comprising:
- (1) from about 1 to about 25 weight percent of a high molecular weight siloxane-oxyalkylene copolymer having the average composition,
- Bu(OC.sub.2 H.sub.4).sub.d (OC.sub.3 H.sub.6).sub.c O.sub.0.5 [(Me.sub.2 SiO).sub.b (MeSiO.sub.1.5).sub.a ][.sub.0.5 O(C.sub.3 H.sub.6 O).sub.c (C.sub.2 H.sub.4 O).sub.d Bu].sub.a+1
- where Me is methyl, Bu is butyl, a has an average value from 1 to 2, b has an average value from about 12 to about 24, c has an average value from about 10 to about 30, and d has an average value from about 10 to about 40;
- and (2) from about 75 to about 99 weight percent of a low molecular weight cyanoalkylsiloxane having the average composition, ##STR16## where Me is methyl, R' is an alkylene containing 3 to 6 carbon atoms, q has an average value from about 1 to about 4, and r has an average value from about 0.5 to about 4, said weight percents being based on the weights of (1) and (2).
1 more element
Dependencies are inferred from the claim text.