US3887500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organosilicone polymers
Assignee: Union Carbide Corp
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Filing: 1973-11-29
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Granted: 1975-06-03
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Expires: 1993-11-29
Abstract
Abstract Organosilicone polymers are provided which comprise polysiloxane-polyoxyalkylene block copolymers wherein the polysiloxane blocks are trialkylsiloxy-endblocked and contain reoccurring difunctional dialkylsiloxy monomeric units in combination with reoccurring difunctional cyanoalkyl-alkylsiloxy or cyanoalkoxyalkylsiloxy monomeric units, the mol ratio of the dialkylsiloxy units to the cyano-substituted siloxy units being about 10-200:3-100, and wherein the polysiloxane and polyoxyalkylene blocks are joined through an Si-C or an Si-O-C linkage, and from about 20 to about 65 weight per cent of the oxyalkylene units of the polyoxyalkylene blocks are constituted of oxyethylene units. The block copolymers of the invention are effective stabilizers of flexible polyether polyolbased polyurethane foams and offer particular advantage in the formation of flame-retarded foams. Also provided is a particular class of cyano-substituted polyalkylsiloxane hydrides which are useful in the preparation of the aforesaid block copolymers.
Inventors
- 👤 Bela Prokai
- 👤 Bernard Kanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:02
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/46
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
40 words
A PROCESS FOR PRODUCING FLIXIBLE POLYURETHANE FOAM WHICH COMPRISES REACTING AND FOAMING A REACTION MIXTURE COMPRISING: A. A POLYETHER POLYOL REACTANT CONTAINING AN AVERAGE OF AT LEAST TWO HYDROXYL GROUPS PER MOLECULE, B. A POLYISOCYANATE REACTANT CONTAINING AT LEAST TWO
Claim 2
Dependent Claim
40 words
A PROCESS FOR PRODUCING FLIXIBLE POLYURETHANE FOAM WHICH COMPRISES REACTING AND FOAMING A REACTION MIXTURE COMPRISING: A. A POLYETHER POLYOL REACTANT CONTAINING AN AVERAGE OF AT LEAST TWO HYDROXYL GROUPS PER MOLECULE, B. A POLYISOCYANATE REACTANT CONTAINING AT LEAST TWO
Claim 3
Dependent Claim
68 words
A process for producing flexible polyurethane foam which comprises reacting and foaming a reaction mixture comprising: a. a polyether polyol reactant containing an average of at least two hydroxyl groups per molecule, b. a polyisocyanate reactant containing at least two isocyanato groups per molecule, c. a blowiNg agent, d. a catalyst comprising an amine, and e. a foam stabilizer comprising a polysiloxanepolyoxyalkylene block copolymer having the average composition,
Claim 4
Dependent Claim
68 words
A process for producing flexible polyurethane foam which comprises reacting and foaming a reaction mixture comprising: a. a polyether polyol reactant containing an average of at least two hydroxyl groups per molecule, b. a polyisocyanate reactant containing at least two isocyanato groups per molecule, c. a blowiNg agent, d. a catalyst comprising an amine, and e. a foam stabilizer comprising a polysiloxanepolyoxyalkylene block copolymer having the average composition,
Claim 5
Dependent Claim
16 words
A process as defined in claim 1 in which the reaction mixture contains a flame-retarding agent.
Claim 6
Dependent Claim
13 words
A flexible polyurethane foam produced in accordance with the method of claim 1.
Claim 7
Dependent Claim
70 words
A process for producing flexible polyurethane foam which comprises reacting and foaming a reaction mixture comprising: a. a polyether polyol reactant containing an average of at least two hydroxyl groups per molecule, b. a polyisocyanate reactant containing at least two isocyanato groups per molecule, c. a blowing agent comprising water, d. a catalyst comprising a tertiary-amine, and e. a foam stabilizer comprising a polysiloxanepolyoxyalkylene block copolymer having the average composition,
Claim 8
Dependent Claim
70 words
A process for producing flexible polyurethane foam which comprises reacting and foaming a reaction mixture comprising: a. a polyether polyol reactant containing an average of at least two hydroxyl groups per molecule, b. a polyisocyanate reactant containing at least two isocyanato groups per molecule, c. a blowing agent comprising water, d. a catalyst comprising a tertiary-amine, and e. a foam stabilizer comprising a polysiloxanepolyoxyalkylene block copolymer having the average composition,
Claim 9
Dependent Claim
15 words
A process as defined in claim 4 in which -R*CN of said copolymer is cyanopropyl.
Claim 10
Dependent Claim
87 words
A process for producing flame-retarded, flexible polyurethane foam which comprises reacting and foaming a reaction mixture containing: a. a polyether polyol reactant containing an average of at least two hydroxyl groups per molecule, b. an organic polyisocyanate reactant containing at least two isocyanato groups per molecule, c. water as a source of blowing action, d. a catalyst comprising a tertiary-amine, e. a co-catalyst comprising an organic derivative of tin, f. a flame-retarding agent, and g. a foam stabilizer comprising a polysiloxane-polyoxyalkyLene block copolymer having the average composition,
Claim 11
Dependent Claim
87 words
A process for producing flame-retarded, flexible polyurethane foam which comprises reacting and foaming a reaction mixture containing: a. a polyether polyol reactant containing an average of at least two hydroxyl groups per molecule, b. an organic polyisocyanate reactant containing at least two isocyanato groups per molecule, c. water as a source of blowing action, d. a catalyst comprising a tertiary-amine, e. a co-catalyst comprising an organic derivative of tin, f. a flame-retarding agent, and g. a foam stabilizer comprising a polysiloxane-polyoxyalkyLene block copolymer having the average composition,
Claim 12
Dependent Claim
12 words
A flame-retarded, flexible polyurethane foam produced by the process of claim 6.
Claim 13
Dependent Claim
50 words
The process of claim 6 in which R**- of said copolymer is a lower alkyl group, x has an average value from about 20 to about 100, y has an average value from about 5 to about 20, and z has an average value from about 2 to about 10.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |