Patent US3876567A successfully refreshed from Google Patents.
US3876567A
Expired / Lapsed
US
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Method for preparing low density polyurethane foams in the presence of methylene chloride
Assignee: Air Products and Chemicals Inc
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Filing: 1973-06-15
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Granted: 1975-04-08
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Expires: 1993-06-15
Abstract
Abstract This invention relates to a process for preparing low density polyurethane foams using relatively large amounts of methylene chloride as the foaming agent in the presence of a stannous carboxylate as the gel catalyst and a foaming catalyst comprising an antimony compound, a base, and a nitrogen-containing organic compound.
Inventors
- 👤 William A Larkin
- 👤 Jr Robert C Ringwood
- 👤 Kenneth Treadwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/144; C08J9/145; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/166; C08G18/168; C08G18/22; C08G18/225; C08G18/227; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
233 words
A METHOD FOR PREPARING A CELLULAR POLYURETHANE WHICH COMPRISES REACTING 100 PARTS BY WEIGHT OF A POLYOL HAVING REACTIVE HYDROGENS AS DETERMINED BY THE ZEREWITINOFF METHOD; 5-300 PARTS BY WEIGHT OF AN ORGANIC POLYFUNCTIONAL ISOCYANATE; 1-10 PARTS OF WATER; BETWEEN 0.5 AND 40 PARTS OF A FOAMING AGENT CONTAINING BETWEEN 30 AND 100% BY WEIGHT OF METHYLENE CHLORIDE; 0.005-5.0 PARTS OF A GEL CATALYST SELECTED FROM THE GROUP CONSISTING OF STANNOUS SALTS OF CARBOXYLIC ACIDS OF THE FORMULA SN(OCOR)2 WHEREIN THE ACID CONTAINS BETWEEN 1 AND 20 CARBON ATOMS AND ORGANOTIN COMPOUNDS OF THE GENERAL FORMULA R2''SNX2 WHEREIN R( IS SELECTED FROM THE GROUP CONSISTING OF ALKYL AND ALKENYL RADICALS, EACH OF WHICH CONTAINS BETWEEN 1 TO 18 CARBON ATOMS, CYCLOALKYL, ARYL, ALKARYL AND ARALKYL RADICALS, AND X REPRESENTS A MONOVALENT RADICAL SELECTED FROM THE GROUP CONSISTING OF HALOGEN ATOMS AND RADICALS OF THE GENERAL FORMULAE R"COO-, R"S-, R"O- AND SR"''COOR" WHEREIN R" IS IN TURN SELECTED FROM THE SAME GROUP AS R'' AND R"'' IS AN ALKYLENE RADICAL CONTAINING BETWEEN 1 AND 8 CARBON ATOMS, AND 0.005 TO 5 PARTS OF A FOAMING CATALYST CONTAINING (1) 10 TO 90% BY WEIGHT OF AN ANTIMONY COMPOUND OF A GENERAL FORMULA SELECTED FROM THE GROUP CONSISTING OF SB2O3, SB2O5 AND SB(Y)N WHEREIN N IS 3 OR 5 AND Y IS SELECTED FROM THE GROUP CONSISTING OF -R1, -OOCR1, HALOGEN, -OR1, -SR1, -OOCR2SH, -SR2COOR1 AND
Claim 2
Independent Claim
233 words
A METHOD FOR PREPARING A CELLULAR POLYURETHANE WHICH COMPRISES REACTING 100 PARTS BY WEIGHT OF A POLYOL HAVING REACTIVE HYDROGENS AS DETERMINED BY THE ZEREWITINOFF METHOD; 5-300 PARTS BY WEIGHT OF AN ORGANIC POLYFUNCTIONAL ISOCYANATE; 1-10 PARTS OF WATER; BETWEEN 0.5 AND 40 PARTS OF A FOAMING AGENT CONTAINING BETWEEN 30 AND 100% BY WEIGHT OF METHYLENE CHLORIDE; 0.005-5.0 PARTS OF A GEL CATALYST SELECTED FROM THE GROUP CONSISTING OF STANNOUS SALTS OF CARBOXYLIC ACIDS OF THE FORMULA SN(OCOR)2 WHEREIN THE ACID CONTAINS BETWEEN 1 AND 20 CARBON ATOMS AND ORGANOTIN COMPOUNDS OF THE GENERAL FORMULA R2''SNX2 WHEREIN R( IS SELECTED FROM THE GROUP CONSISTING OF ALKYL AND ALKENYL RADICALS, EACH OF WHICH CONTAINS BETWEEN 1 TO 18 CARBON ATOMS, CYCLOALKYL, ARYL, ALKARYL AND ARALKYL RADICALS, AND X REPRESENTS A MONOVALENT RADICAL SELECTED FROM THE GROUP CONSISTING OF HALOGEN ATOMS AND RADICALS OF THE GENERAL FORMULAE R"COO-, R"S-, R"O- AND SR"''COOR" WHEREIN R" IS IN TURN SELECTED FROM THE SAME GROUP AS R'' AND R"'' IS AN ALKYLENE RADICAL CONTAINING BETWEEN 1 AND 8 CARBON ATOMS, AND 0.005 TO 5 PARTS OF A FOAMING CATALYST CONTAINING (1) 10 TO 90% BY WEIGHT OF AN ANTIMONY COMPOUND OF A GENERAL FORMULA SELECTED FROM THE GROUP CONSISTING OF SB2O3, SB2O5 AND SB(Y)N WHEREIN N IS 3 OR 5 AND Y IS SELECTED FROM THE GROUP CONSISTING OF -R1, -OOCR1, HALOGEN, -OR1, -SR1, -OOCR2SH, -SR2COOR1 AND
Claim 3
Dependent Claim
22 words
The method for preparing a cellular polyurethane as claimed in claim 1 wherein said nitrogen-containing organic compound is an amino-substituted carboxylic acid.
Claim 4
Dependent Claim
23 words
The method for preparing a cellular polyurethane as claimed in claim 1 wherein the nitrogen-containing organic compound is an amidoxime of the formula
Claim 5
Dependent Claim
23 words
The method for preparing a cellular polyurethane as claimed in claim 1 wherein said nitrogen-containing organic compound is an amidoxime of the formula
Claim 6
Dependent Claim
24 words
The method for preparing a cellular polyurethane as claimed in claim 1 wherein said nitrogen-containing organic compound is a hydroxamic acid of the formula
Claim 7
Dependent Claim
19 words
The method for preparing a cellular polyurethane as claimed in claim 1 wherein said antimony compound is antimony tritallate.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |