Patent US4018724A successfully refreshed from Google Patents.
US4018724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant flexible urethane foams
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1976-03-29
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Granted: 1977-04-19
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Expires: 1996-03-29
Abstract
Abstract The discoloration occurring during commercial production of large buns or slabs of low density, flexible and semiflexible polyetherurethane foams containing chlorine-containing polymers such as polyvinyl chloride, zinc oxide and antimony oxide, in which optionally part of the chlorine-containing polymer can be replaced with a chlorinated paraffin provided a proportionate reduction is made in the amount of the zinc oxide employed, is reduced or prevented by using a small amount of a zinc salt selected from the group consisting of ##STR1## --halogen, --hydrogen, or a --nitro group, R' being a C 1 to C 10 alkyl, cycloalkyl, aralkyl, alkaryl or aryl group, preferably said zinc salt has the formula: ##STR2##
Inventors
- 👤 David Stanley Cobbledick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0095; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/36; C08K5/45; C08K5/46; C08K5/47; C08L; C08L101/00; C08L101/02; C08L101/04; C08L75/00; C08L75/04; C08L75/08; C08J2375/00; C08J2375/04; C08J2375/08; Y; Y10; Y10S; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
220 words
In the method of making a fluid or semiflexible low density, flame retardant polyurethane foam using the one-shot or prepolymer process by the reaction of (A) a polyetherpolyol having from two to four hydroxyl groups and having a molecular weight of from about 1,000 to 10,000, (B) an organic polyisocyanate and (C) a blowing agent comprising water in admixture with (D) a surfactant, (E) a catalyst, (F) from about 1 to 50 parts by weight per 100 parts by weight of said polyol of a finely divided, solid chlorine-containing polymeric resin having an intrinsic viscosity of from about 0.25 to 2.5, (G) finely divided zinc oxide in an amount of from about 0.1 to 10 parts by weight per 100 parts by weight of said polyol, and (H) finely divided antimony trioxide in an amount of from about 0.5 to 15 parts by weight per 100 parts by weight of said polyol, the improvement comprising incorporating in said formulation prior to foaming a finely divided zinc salt selected from the group consisting of ##STR7## --halogen, --hydrogen, or a --nitro group, R' being a C 1 to C 10 alkyl, cycloalkyl, aralkyl, alkaryl or aryl group, said zinc salt being used in an amount of from about 0.05 to 5.00 parts by weight per 100 parts by weight of total polyol.
Claim 2
Dependent Claim
220 words
In the method of making a fluid or semiflexible low density, flame retardant polyurethane foam using the one-shot or prepolymer process by the reaction of (A) a polyetherpolyol having from two to four hydroxyl groups and having a molecular weight of from about 1,000 to 10,000, (B) an organic polyisocyanate and (C) a blowing agent comprising water in admixture with (D) a surfactant, (E) a catalyst, (F) from about 1 to 50 parts by weight per 100 parts by weight of said polyol of a finely divided, solid chlorine-containing polymeric resin having an intrinsic viscosity of from about 0.25 to 2.5, (G) finely divided zinc oxide in an amount of from about 0.1 to 10 parts by weight per 100 parts by weight of said polyol, and (H) finely divided antimony trioxide in an amount of from about 0.5 to 15 parts by weight per 100 parts by weight of said polyol, the improvement comprising incorporating in said formulation prior to foaming a finely divided zinc salt selected from the group consisting of ##STR7## --halogen, --hydrogen, or a --nitro group, R' being a C 1 to C 10 alkyl, cycloalkyl, aralkyl, alkaryl or aryl group, said zinc salt being used in an amount of from about 0.05 to 5.00 parts by weight per 100 parts by weight of total polyol.
Claim 3
Dependent Claim
14 words
The method according to claim 1 wherein said zinc salt has the formula ##STR8##
Claim 4
Dependent Claim
100 words
The method according to claim 2 wherein said formulation contains additionally a chlorinated paraffin having an average molecular weight of from about 250 to 1400 and containing from about 40 to 70% by weight of chlorine, wherein said chlorinated paraffin is used in an amount by weight sufficient to replace from about 5 to 80% by weight of said chlorine-containing polymeric resin on essentially a percent by weight chlorine (Cl) basis, and wherein the percent by weight of said zinc oxide is essentially proportionally reduced in accordance with the reduction in the percent by weight of said chlorine-containing polymeric resin.
Claim 5
Dependent Claim
32 words
The method according to claim 2 where said zinc salt is used in an amount of from about 0.2 to 1.0 part by weight per 100 parts by weight of total polyol.
Claim 6
Dependent Claim
29 words
The method according to claim 4 where said zinc salt is used in an amount of about 0.5 part by weight per 100 parts by weight of total polyol.
Claim 7
Dependent Claim
164 words
A low density, flexible or semiflexible flame retardant polyetherurethane foam, the ether moieties of said foam being derived from polyether polyols having a molecular weight of from about 1,000 to 10,000 and having from 2 to 4 hydroxyl groups containing, based on 100 parts by weight total of said polyol, (I) from about 1 to 50 parts by weight of a finely divided, solid chlorine containing polymeric resin having an intrinsic viscosity of from about 0.25 to 2.5, (II) finely divided zinc oxide in an amount of from about 0.1 to 10 parts by weight, (III) finely divided antimony trioxide in an amount of from about 0.5 to 15 parts by weight, and (IV) a finely divided zinc salt selected from the group consisting of ##STR9## --halogen, --hydrogen, or a --nitro group, R' being a C 1 to C 10 alkyl, cycloalkyl, aralkyl, alkaryl or aryl group, said zinc salt being used in an amount of from about 0.05 to 5.00 parts by weight.
Claim 8
Dependent Claim
164 words
A low density, flexible or semiflexible flame retardant polyetherurethane foam, the ether moieties of said foam being derived from polyether polyols having a molecular weight of from about 1,000 to 10,000 and having from 2 to 4 hydroxyl groups containing, based on 100 parts by weight total of said polyol, (I) from about 1 to 50 parts by weight of a finely divided, solid chlorine containing polymeric resin having an intrinsic viscosity of from about 0.25 to 2.5, (II) finely divided zinc oxide in an amount of from about 0.1 to 10 parts by weight, (III) finely divided antimony trioxide in an amount of from about 0.5 to 15 parts by weight, and (IV) a finely divided zinc salt selected from the group consisting of ##STR9## --halogen, --hydrogen, or a --nitro group, R' being a C 1 to C 10 alkyl, cycloalkyl, aralkyl, alkaryl or aryl group, said zinc salt being used in an amount of from about 0.05 to 5.00 parts by weight.
Claim 9
Dependent Claim
14 words
A foam according to claim 6 where said zinc salt has the formula ##STR10##
Claim 10
Dependent Claim
97 words
A foam according to claim 7 containing additionally a chlorinated paraffin having an average molecular weight of from about 250 to 1400 and containing from about 40 to 70% by weight of chlorine, wherein said chlorinated paraffin is used in an amount by weight sufficient to replace from about 5 to 80% by weight of said chlorine-containing polymeric resin on essentially a percent by weight chlorine (Cl) basis, and wherein the percent by weight of said zinc oxide is essentially proportionally reduced in accordance with the reduction in the percent by weight of said chlorine-containing polymeric resin.
Claim 11
Dependent Claim
24 words
A foam according to claim 7 where said zinc salt is used in an amount of from about 0.2 to 1.0 part by weight.
Claim 12
Dependent Claim
21 words
A foam according to claim 9 where said zinc salt is used in an amount of about 0.5 part by weight.
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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |