US4268637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elimination of bloom in [vul-cup] peroxide crosslinked elastomer compounds
Assignee: Hercules LLC
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Filing: 1979-06-07
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Granted: 1981-05-19
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Expires: 1999-06-07
Abstract
Abstract Disclosed are nonblooming, crosslinkable compositions comprising crosslinkable elastomer, a peroxide crosslinker selected from α,α'-bis(t-butylperoxy) meta-diisopropylbenzene, α,α'-bis(t-butylperoxy) para-diisopropylbenzene and mixtures thereof, and phthalic anhydride.
Inventors
- 👤 Winfred E. Weldy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:22
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/092; C08K5/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
57 words
A crosslinkable composition comprising an elastomeric component selected from ethylene-propylene terpolymer rubbers and blends of said rubbers with silicone rubbers; an effective amount of a peroxide selected from α,α'-bis(t-butylperoxy) para-diisopropylbenzene, α,α'-bis(t-butylperoxy) metadiisopropylbenzene and mixtures thereof; and phthalic anhydride, the amount of phthalic anhydride employed being about 2.0 moles to about 6.0 moles per mole of peroxide employed.
Claim 2
Dependent Claim
57 words
A crosslinkable composition comprising an elastomeric component selected from ethylene-propylene terpolymer rubbers and blends of said rubbers with silicone rubbers; an effective amount of a peroxide selected from α,α'-bis(t-butylperoxy) para-diisopropylbenzene, α,α'-bis(t-butylperoxy) metadiisopropylbenzene and mixtures thereof; and phthalic anhydride, the amount of phthalic anhydride employed being about 2.0 moles to about 6.0 moles per mole of peroxide employed.
Claim 3
Dependent Claim
41 words
A composition comprising a peroxide selected from α,α'-bis(t-butylperoxy) meta-diisopropylbenzene, α,α'-bis(t-butylperoxy) para-diisopropylbenzene and mixtures thereof and phthalic anhydride, the amount of phthalic anhydride present in the composition being, by weight, from about 88 parts to about 260 parts per 100 parts peroxide.
Claim 4
Dependent Claim
41 words
A composition comprising a peroxide selected from α,α'-bis(t-butylperoxy) meta-diisopropylbenzene, α,α'-bis(t-butylperoxy) para-diisopropylbenzene and mixtures thereof and phthalic anhydride, the amount of phthalic anhydride present in the composition being, by weight, from about 88 parts to about 260 parts per 100 parts peroxide.
Claim 5
Dependent Claim
16 words
The composition of claim 2 wherein the peroxide and phthalic anhydride are supported on a carrier.
Claim 6
Dependent Claim
12 words
A nonblooming article obtained by crosslinking the crosslinkable composition of claim 1.
Claim 7
Dependent Claim
24 words
The composition of claim 1 wherein the amount of phthalic anhydride is from about 3.0 moles to about 5.0 moles per mole of peroxide.
Claim 8
Dependent Claim
24 words
The composition of claim 2 wherein the amount of phthalic anhydride is from about 130 parts to about 220 parts per 100 parts peroxide.
Claim 9
Dependent Claim
16 words
The composition of claim 6 wherein the peroxide and phthalic anhydride are supported on a carrier.
Claim 10
Dependent Claim
12 words
A nonblooming article obtained by crosslinking the crosslinkable composition of claim 5.
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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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |