Patent US4259452A successfully refreshed from Google Patents.
US4259452A
Expired / Lapsed
US
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Method of producing flexible reticulated polyether polyurethane foams
Assignee: Bridgestone Corp
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Filing: 1979-05-15
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Granted: 1981-03-31
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Expires: 1999-05-15
Abstract
Abstract A method of producing flexible polyether polyurethane foams, which have a substantially skeletal reticulated structure, is disclosed. When the flexible foam is produced by reacting a polyhydroxyl compound with an organic polyisocyanate in the presence of a blowing agent by one-shot process, a catalyst and other additives, a mixture of (a) poly(oxyethylene-oxypropylene)polyether polyol containing 51 to 98% by weight of ethylene oxide component and (b) poly(oxyethylene-oxypropylene)polyether polyol containing not less than 51% by weight of propylene oxide component is used as the polyhydroxyl compound.
Inventors
- 👤 Toshio Yukuta
- 👤 Kazuo Yagura
- 👤 Nobuhisa Fuchigami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:16
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3829; C08G18/4804; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0083; C08G2310/00; Y; Y10; Y10S; Y10S521/00; Y10S521/914
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A method for producing a flexible polyether polyurethane foam by reacting a polyhydroxyl compound with an organic polyisocyanate in the presence of a catalyst, a blowing agent, a surfactant and other additives by a one-shot process, characterized in that as said polyhydroxyl compound there is used a mixture of (a) 50-90 parts by weight of poly(oxyethylene-oxypropylene)polyether polyol containing 51 to 90% by weight of ethylene oxide component and (b) 10-50 parts by weight of poly(oxyethylene-oxypropylene)polyether polyol containing not less than about 98% by weight of propylene oxide component to form a foam having a substantially skeletal reticulated structure.
Claim 2
Independent Claim
98 words
A method for producing a flexible polyether polyurethane foam by reacting a polyhydroxyl compound with an organic polyisocyanate in the presence of a catalyst, a blowing agent, a surfactant and other additives by a one-shot process, characterized in that as said polyhydroxyl compound there is used a mixture of (a) 50-90 parts by weight of poly(oxyethylene-oxypropylene)polyether polyol containing 51 to 90% by weight of ethylene oxide component and (b) 10-50 parts by weight of poly(oxyethylene-oxypropylene)polyether polyol containing not less than about 98% by weight of propylene oxide component to form a foam having a substantially skeletal reticulated structure.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1, wherein said mixture has an average hydroxyl number of 30-70.
Claim 4
Dependent Claim
18 words
A method as claimed in claim 1, wherein said catalyst is selected from organotin compounds and amine compounds.
Claim 5
Dependent Claim
26 words
A method as claimed in claim 3, wherein said organotin compound is selected from dibutyltin dilaurate, stannous octoate, stannous oleate, dibutyltin di-2-ethyl hexoate and dibutyltin diacetate.
Claim 6
Dependent Claim
34 words
A method as claimed in claim 4, wherein said dibutyltin dilaurate is used in an amount of not more than 0.1 part by weight based on 100 parts by weight of said polyhydroxyl compound.
Claim 7
Dependent Claim
35 words
A method as claimed in claim 1, wherein as said other additive is used urea in an amount of 0.05 to 5 parts by weight based on 100 parts by weight of said polyhydroxyl compound.
Claim 8
Dependent Claim
36 words
A method as claimed in claim 1, wherein as said blowing agent is used water in an amount of not less than 4.5 parts by weight based on 100 parts by weight of said polyhydroxyl compound.
References Cited (Backward Citations)
FR1406036A
Cited
US3799898A
Cited
US3865762A
Cited
FR2129823A1
Cited
US3717597A
Cited
US3873476A
Cited
US3887505A
Cited
US4144386A
Cited
US4167612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |