US4067831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyurethane foams
Assignee: Dow Chemical Co
•
Filing: 1975-05-27
•
Granted: 1978-01-10
•
Expires: 1995-05-27
Abstract
Abstract An improved process for the preparation of flexible polyurethane foams which comprise conducting the foaming in the presence of a delayed action catalyst and an inorganic filler having a pH 5 to 10, preferably 6 to 8, and an average particle size of 2-30 microns, preferably 5-15 microns. The process is suitable for slabstock and molded foams.
Inventors
- 👤 George J. Wasilczyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2009; C08G18/2027; C08G18/22; C08G18/24; C08G18/242; C08K; C08K3/00; C08K3/01; C08K3/013; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0058; C08G2110/0083; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
In a process for preparing flexible polyurethane foams by reacting a polyol with a polyisocyanate in the presence of a foaming agent, a cell control agent and catalysts, the improvement which comprises conducting the reaction additionally in the presence of ( 1) from about 0.001 to about 1.5 parts per 100 parts of polyol of a delayed action catalyst having a T.sub.Δη1000 /T.sub.Δη10000 value of at least 0.7 as measured on a mixture of the polyol, polyisocyanate and delayed action catalyst components and when employed, crosslinker and water at an initial mixing temperature of about room temperature and (2) an inorganic filler having a pH of 5 to 10 and an average particle size of from about 2 microns to about 30 microns.
Claim 2
Dependent Claim
123 words
In a process for preparing flexible polyurethane foams by reacting a polyol with a polyisocyanate in the presence of a foaming agent, a cell control agent and catalysts, the improvement which comprises conducting the reaction additionally in the presence of ( 1) from about 0.001 to about 1.5 parts per 100 parts of polyol of a delayed action catalyst having a T.sub.Δη1000 /T.sub.Δη10000 value of at least 0.7 as measured on a mixture of the polyol, polyisocyanate and delayed action catalyst components and when employed, crosslinker and water at an initial mixing temperature of about room temperature and (2) an inorganic filler having a pH of 5 to 10 and an average particle size of from about 2 microns to about 30 microns.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein said inorganic filler has a pH of from about 6 to about 8 and an average particle size of from about 5 microns to about 15 microns.
Claim 4
Dependent Claim
47 words
The process of claim 2 wherein the delayed action catalyst is present in quantities of from about 0.03 to about 0.12 parts per 100 parts of polyol and the filler is employed in quantities of from about 5 to about 100 parts per 100 parts of polyol.
Claim 5
Dependent Claim
24 words
The process of claim 3 wherein the delayed action catalyst is a sulfur containing organo-tin compound or the reaction product of phenylisocyanate with 2-methylimidazole.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein the filler is an amorphous silica or a hydrated alumina.
References Cited (Backward Citations)
US3392153A
Cited
US3148162A
Cited
US3391091A
Cited
US3311648A
Cited
US3853795A
Cited
US3821130A
Cited
US3980579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |