Back to results
US 8,476,330 B2Granted
Polyurethane foam containing synergistic surfactant combinations and process for making same
AssigneeMomentive Performance Materials Inc.
InventorMichael Angelo Dimitroff
Life of this patent
Estimating the term…
Abstract
The present invention relates to a composition and process for preparing fine-celled polyurethane foam obtained from frothing a polyurethane foam-forming composition possessing a synergistic combination of silicone surfactants.
Claims52
A polyurethane foam-forming composition which comprises:
- a) at least one polyol possessing a weight average molecular weight from about 500 to about 20,000;
- b) at least one polyisocyanate and/or polythioisocyanate;
- c) at least one polyurethane catalyst;
- d) at least one polysiloxane/polyoxyalkylene (AB)n-type block silicone surfactant copolymer in an amount of from 0.5 to 8 parts based on 100 parts of the polyol (a), wherein the copolymer (d) is selected from the group consisting of hydrolyzable (AB)n-type block silicone surfactant copolymers having the general structures:
- [(R2SiO)x—(CmH2mO)y]n;
- and
- HO—(CmH2mO)y—[(R2SiO)x—(CmH2mO)y]n—H
- wherein each occurrence of R is methyl;
- x is greater than 4;
- m equals an integer or a mixture of integers from 2 to 4;
- y is greater than 10;
- and n is greater than 4, and with the provisos that
- (i) the hydrolyzable (AB)n-type block silicone surfactant copolymer has a weight average molecular weight of from 65,000 to 250,000;
- (ii) each siloxane block of the hydrolyzable (AB)n-type block silicone surfactant copolymer has a weight average molecular weight of from 300 to 10,000;
- (iii) each polyoxyalkylene block of the hydrolyzable (AB)n-type block silicone surfactant copolymer has a weight average molecular weight of from 2,000 to 4,000;
- and
- (iv) the siloxane blocks constitute from 20 to 50 weight percent of said copolymer and the polyoxyalkylene blocks constitute 80 to 50 weight percent of said copolymer;
- e) at least one non-hydrolyzable polysiloxane-polyoxyalkylene pendant-type silicone surfactant copolymer in an amount of from 0.1 to 4 parts based on 100 parts of the polyol (a), wherein the copolymer (e) comprises repeating siloxane units having the general structure:
- RaFbSiO(4-a-b)/2
- wherein R is methyl;
- a has an average value over all siloxane units from 1 to 2.9;
- b has an average value over all siloxane units from 0.1 to 1;
- each F is a polyoxyalkylene having the formula:
- —(CqH2q)—O—(CmH2mO)r—H or
- —(CqH2q)—O—(CmH2mO)r—R2 or
- —(CqH2q)—O—(CmH2mO)r—(CO)—R2
- where each m is independently an integer of from 2 to 4;
- each q is independently an integer from 2 to 6;
- r is greater than 1;
- and R2 is methyl, and with the provisos that
- (i) the non-hydrolyzable pendant-type copolymer has a weight average molecular weight of from 4,500 to 14,000;
- (ii) the siloxane blocks of the non-hydrolyzable pendant-type copolymer constitute of from 26 to 49 weight percent of the copolymer,
- (iii) each polyoxyalkylene block of the non-hydrolyzable pendant-type copolymer has a weight average molecular weight of from 550 to 1,500, and contains from 75 to 100 weight percent oxyethylene groups;
- and
- (iv) the sum of a and b has an average value over all siloxane units from 1.5 to 3.0;
- and,
- f) optionally, at least one component selected from the group consisting of polymer and/or copolymer, blowing agent, chain extender, crosslinkers, filler, reinforcement, pigments, tints, colorants, flame retardant, antioxidants, thermal or thermal-oxidative degradation inhibitors, UV stabilizers, ITV absorbers, anti-static agent, biocide, anti-microbial agent and gas-fade inhibiting agent.
34 more elements
A polyurethane foam-forming composition which comprises:
- a) at least one polyol possessing a weight average molecular weight from about 500 to about 20,000;
- b) at least one polyisocyanate and/or polythioisocyanate;
- c) at least one polyurethane catalyst;
- d) at least one polysiloxane/polyoxyalkylene
- (AB)n-type block silicone surfactant copolymer
- in an amount of from 0.5 to 8 parts based on 100 parts of the polyol (a), wherein said copolymer is a non-hydrolyzable polysiloxane/polyoxyalkylene (AB)n-type block silicone surfactant copolymer and with the provisos that the hydrolysable (AB)n-type block silicone surfactant copolymer has a weight average molecular weight of from 65,000 to 250,000;
- (i) each siloxane block of the non-hydrolysable (AB)n-type block silicone surfactant copolymer has a weight average molecular weight of from 300 to 10,000;
- (ii) each polyoxyalkylene block of the non-hydrolysable (AB)n-type block silicone surfactant copolymer has a weight average molecular weight of from 2,000 to 4,000;
- and
- (iii) the siloxane blocks constitute from 20 to 50 weight percent of said copolymer and the polyoxyalkylene blocks constitute 80 to 50 weight percent of said copolymer;
- and
- e) at least one non-hydrolyzable polysiloxane-polyoxyalkylene pendant-type silicone surfactant copolymer comprising repeating siloxane units having the general structure:
- RaFbSiO(4-a-b)/2
- wherein
- R is methyl;
- a has an average value over all siloxane units from 1 to 2.9;
- b has an average value over all siloxane units from 0.1 to 1;
- each F is a polyoxyalkylene having the formula:
- —(CqH2q)—O—(CmH2mO)r—H or
- —(CqH2q)—O—(CmH2mO)r—R2 or
- —(CqH2q)—O—(CmH2mO)r—(CO)—R2
- where each m is independently an integer of from 2 to 4;
- each q is independently an integer from 2 to 6;
- r is greater than 1, R2 is methyl,
- in an amount of from 0.1 to 4 parts based on 100 parts of the polyol (a), and with the provisos that
- (i) the non-hydrolyzable pendant-type copolymer has a weight average molecular weight of from 4,500 to 14,000;
- (ii) the siloxane blocks of the non-hydrolyzable pendant-type copolymer constitute of from 26 to 49 weight percent of the copolymer,
- (iii) each polyoxyalkylene block of the non-hydrolyzable pendant-type copolymer has a weight average molecular weight of from 550 to 1,500, and contains from 75 to 100 weight percent oxyethylene groups;
- and
- (iv) the sum of a and b has an average value over all siloxane units from 1.5 to 3.0;
- and,
- f) optionally, at least one component selected from the group consisting of polymer and/or copolymer, blowing agent, chain extender, crosslinkers, filler, reinforcement, pigments, tints, colorants, flame retardant, antioxidants, thermal or thermal-oxidative degradation inhibitors, UV stabilizers, LTV absorbers, anti-static agent, biocide, anti-microbial agent and gas-fade inhibiting agent.
29 more elements
Dependencies are inferred from the claim text.