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Patent US5130346A successfully refreshed from Google Patents.
US5130346A
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Method for producing a low-density flexible polyurethane foam
Assignee: Bridgestone Corp
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Filing: 1990-10-18
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Granted: 1992-07-14
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Expires: 2010-10-18
Abstract
Abstract A method producing a low-density flexible polyurethane foam comprising stirring a starting mixture containing a polyhydroxy compound, a polyisocyanate, a foaming agent and a catalyst to thereby foam the mixture, in which a foaming agent selected from the group consisting of water, formic acid and its salts is used in an amount of at least 10% by weight as water equivalent per 100 parts by weight of the polyhydroxy compound, and the mixture is stirred at 15° C. or below by previously adjusting the temperature of the mixture to 15° C. or below and under a highly catalytic activity.
Inventors
- 👤 Seiji Ishii
- 👤 Tokuo Okada
- 👤 Hiroya Fukuda
- 👤 Takashi Ohashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:26
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G18/00; C08G18/06; C08G18/08; C08J9/04; C08J9/06; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0083; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
A method for producing a low-density flexible polyurethane foam comprising stirring a starting mixture containing a polyhydroxy compound, a polyisocyanate, a foaming agent and a catalyst to thereby foam said mixture, characterized in that the foaming agent is a member selected from the group consisting of water, formic acid and a mixture thereof and used in an amount of at least 5 parts by weight as water equivalent per 100 parts by weight of said polyhydroxy compound, in that the catalyst is at least one member selected from the group consisting of a tertiary amine catalyst and an organic tin compound, wherein the starting mixture is stirred at 15° C. or below by previously adjusting the temperatures of said mixture to 15° C. or below and under a highly catalytic activity by using said catalyst, thereby obtaining a low-density flexible polyurethane foam having no internal scorching.
Claim 2
Independent Claim
146 words
A method for producing a low-density flexible polyurethane foam comprising stirring a starting mixture containing a polyhydroxy compound, a polyisocyanate, a foaming agent and a catalyst to thereby foam said mixture, characterized in that the foaming agent is a member selected from the group consisting of water, formic acid and a mixture thereof and used in an amount of at least 5 parts by weight as water equivalent per 100 parts by weight of said polyhydroxy compound, in that the catalyst is at least one member selected from the group consisting of a tertiary amine catalyst and an organic tin compound, wherein the starting mixture is stirred at 15° C. or below by previously adjusting the temperatures of said mixture to 15° C. or below and under a highly catalytic activity by using said catalyst, thereby obtaining a low-density flexible polyurethane foam having no internal scorching.
Claim 3
Dependent Claim
21 words
The method according to claim 1, wherein said polyhydroxy compound and said polyisocyanate are previously cooled to 15° C. or below.
Claim 4
Dependent Claim
60 words
The method according to claim 1, wherein said polyhydroxy compound is a member selected from the group consisting of polyether polyols terminated with a hydroxy group, polyester polyols terminated with a hydroxyl group, polyether polyester polyols which are copolymers of said polyether polyol and said polyester polyol and polymer polyols produced by polymerizing an ethylenically unsaturated monomer in a polyol.
Claim 5
Dependent Claim
23 words
The method according to claim 1, wherein said polyhydroxy compound has a viscosity of 200 to 10,000 cps at 0° to 15° C.
Claim 6
Dependent Claim
75 words
The method according to claim 1, wherein said polyisocyanate is a member selected from the group consisting of tolylene diisocyanate (TDI), crude TDI, 4,4'-diphenylmethane diisocyanate (MDI), crude MDI, aliphatic polyisocyanates in which the aliphatic group has 2 to 18 carbon atoms, alicyclic polyisocyanates in which the alicyclic group has 4 to 15 carbon atoms, aromatic polyisocyanates in which the aromatic group has 8 to 15 carbon atoms and mixtures or modified products of said polyisocyanates.
Claim 7
Dependent Claim
27 words
The method according to claim 1, wherein said catalyst is at least one member selected from the group consisting of tertiary amine catalysts and organic tin compounds.
Claim 8
Dependent Claim
30 words
The method according to claim 6, wherein said tertiary amine catalyst is tetramethyl hexamethylenediamine, tetramethyl ethylenediamine or diazabicycloundecene and said organic tin compound is stannous octoate or dibutyl tin dilaurate.
Claim 9
Dependent Claim
30 words
The method according to claim 1, wherein the catalyst is used in an amount of 1.1 to 10 parts by weight per 100 parts by weight of the polyhydroxy compound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |