US4537915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Char resistant foams
Assignee: BASF SE
•
Filing: 1983-05-09
•
Granted: 1985-08-27
•
Expires: 2003-05-09
Abstract
Abstract The resistance to internal charring of molded styrene-butadiene latex foam rubber when exposed to a lit cigarette is improved by incorporating from about 10 to 30 parts by dry weight, per hundred parts by dry weight of latex of a compound selected from the group consisting of an organic phosphate of the formula <IMAGE> wherein R is a C6-12 alkyl radical or a phenyl radical, which is unsubstituted or substituted by a C1-4 alkyl radical, butyl benzyl phthalate, and a mixture thereof.
Inventors
- 👤 Patrick Oberle
- 👤 Michel Longuet
- 👤 David Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0038; C08J9/0023; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523; C08J2309/00; C08J2309/06; C08J2309/08; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
115 words
A latex composition comprising from about 0 to about 15 parts by dry weight of natural rubber latex and correspondingly from about 100 to about 85 parts by dry weight of styrene-butadiene polymer latex having a styrene:butadiene ratio of from about 20:80 to about 40:60, characterized in that said composition additionally comprises per 100 parts by dry weight of total latex from about 10 to about 30 parts by weight of a compound selected from the group consisting of an organic phosphate of the formula ##STR4## wherin R is a C 6-12 alkyl radical or a phenyl radical which is unsubstituted or substituted by a C 1-4 alkyl radical, butyl benzyl phthalate, and mixtures thereof.
Claim 2
Dependent Claim
115 words
A latex composition comprising from about 0 to about 15 parts by dry weight of natural rubber latex and correspondingly from about 100 to about 85 parts by dry weight of styrene-butadiene polymer latex having a styrene:butadiene ratio of from about 20:80 to about 40:60, characterized in that said composition additionally comprises per 100 parts by dry weight of total latex from about 10 to about 30 parts by weight of a compound selected from the group consisting of an organic phosphate of the formula ##STR4## wherin R is a C 6-12 alkyl radical or a phenyl radical which is unsubstituted or substituted by a C 1-4 alkyl radical, butyl benzyl phthalate, and mixtures thereof.
Claim 3
Dependent Claim
48 words
The latex composition according to claim 1 characterized in that the amount of said natural rubber latex is from about 5 to about 15 parts by dry weight and the amount of said styrene-butadiene polymer latex is correspondingly from about 95 to about 85 parts by dry weight.
Claim 4
Dependent Claim
81 words
The latex composition according to claim 2 characterized in that the amount of said natural rubber latex is about 10 parts by dry weight, the amount of said styrene-butadiene polymer latex is about 90 parts by dry weight wherein said styrene:butadiene ratio is from about 28:72 to about 32:68, and the amount of said compound is from about 15 to about 20 parts by weight per 100 parts by dry weight of total latex wherein said compound is an organic phosphate.
Claim 5
Dependent Claim
21 words
The latex composition according to claim 3 characterized in that in said organic phosphate R is a C 8 alkyl radical.
Claim 6
Dependent Claim
21 words
The latex composition according to claim 3 characterized in that in said organic phosphate R is a C 10 alkyl radical.
Claim 7
Dependent Claim
19 words
The latex composition according to claim 3 characterized in that in said organic phosphate R is a phenyl radical.
Claim 8
Dependent Claim
21 words
The latex composition according to claim 3 characterized in that in said organic phosphate R is a tertiary butyl phenyl radical.
Claim 9
Dependent Claim
81 words
The latex composition according to claim 2 characterized in that the amount of said natural rubber latex is about 10 parts by dry weight, the amount of said styrene-butadiene polymer latex is about 90 parts by dry weight wherein said styrene:butadiene ratio is from about 28:72 to about 32:68, and the amount of said compound is from about 15 to about 20 parts by weight per 100 parts by dry weight of total latex wherein said compound is butyl benzyl phthalate.
Claim 10
Independent Claim
131 words
A method of imparting resistance to charring to a molded foam manufactured from a latex comprising from about 0 to about 15 parts by dry weight of natural rubber latex and correspondingly from about 100 to about 85 parts by dry weight of styrene-butadiene polymer latex having a styrene:butadiene ratio of from about 20:80 to about 40:60 which method is characterized by adding to the total latex from about 10 to about 30 parts by weight per 100 parts by dry weight of said total latex of a compound selected from the group consisting of an organic phosphate of the formula ##STR5## wherein R is a C 6-12 alkyl radical or a phenyl radical which is unsubstituted or substituted by a C 1-4 alkyl radical, butyl benzyl phthalate, and mixtures thereof.
Claim 11
Independent Claim
131 words
A method of imparting resistance to charring to a molded foam manufactured from a latex comprising from about 0 to about 15 parts by dry weight of natural rubber latex and correspondingly from about 100 to about 85 parts by dry weight of styrene-butadiene polymer latex having a styrene:butadiene ratio of from about 20:80 to about 40:60 which method is characterized by adding to the total latex from about 10 to about 30 parts by weight per 100 parts by dry weight of said total latex of a compound selected from the group consisting of an organic phosphate of the formula ##STR5## wherein R is a C 6-12 alkyl radical or a phenyl radical which is unsubstituted or substituted by a C 1-4 alkyl radical, butyl benzyl phthalate, and mixtures thereof.
Claim 12
Dependent Claim
47 words
The method according to claim 9 characterized in that the amount of said natural rubber latex is from about 5 to about 15 parts by dry weight and the amount of said styrene-butadiene polymer latex is correspondingly from about 95 to about 85 parts by dry weight.
Claim 13
Dependent Claim
80 words
The method according to claim 10 characterized in that the amount of said natural rubber latex is about 10 parts by dry weight, the amount of said styrene-butadiene polymer latex is about 90 parts by dry weight wherein said styrene:butadiene ratio is from about 28:72 to about 32:68, and the amount of said compound is from about 15 to about 20 parts by weight per 100 parts by dry weight of total latex wherein said compound is an organic phosphate.
Claim 14
Dependent Claim
20 words
The method according to claim 11 characterized in that in said organic phosphate R is a C 8 alkyl radical.
Claim 15
Dependent Claim
20 words
The method according to claim 11 characterized in that in said organic phosphate R is a C 10 alkyl radical.
Claim 16
Dependent Claim
18 words
The method according to claim 11 characterized in that in said organic phosphate R is a phenyl radical.
Claim 17
Dependent Claim
20 words
The method according to claim 11 characterized in that in said organic phosphate R is a tertiary butyl phenyl radical.
Claim 18
Dependent Claim
80 words
The method according to claim 10 characterized in that the amount of said natural rubber latex is about 10 parts by dry weight, the amount of said styrene-butadiene polymer latex is about 90 parts by dry weight wherein said styrene:butadiene ratio is from about 28:72 to about 32:68, and the amount of said compound is from about 15 to about 20 parts by weight per 100 parts by dry weight of total latex wherein said compound is butyl benzyl phthalate.
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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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |