US4012567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanate ester cure of unsaturated elastomers
Assignee: UG Licensing Services Inc
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Filing: 1975-03-12
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Granted: 1977-03-15
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Expires: 1995-03-12
Abstract
Abstract Unsaturated elastomers (e.g., cis-polyisoprene) and blends containing unsaturated elastomers can be cured (gelled) by admixing with 1 to 10 phr organo titanate ester [(RO)4Ti, e.g., tetra-n-butyl titanate]. Gellation takes place only when the mixture is exposed to the open atmosphere and can be prevented by maintaining the mixture in a closed system.
Inventors
- 👤 Frederick C. Loveless
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:44
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0091; C08K5/04; C08K5/05; C08K5/057
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
A method of curing an unsaturated elastomer consisting essentially of mixing 100 parts by weight of the said elastomer with from 1 to 10 parts by weight of an organo titanate ester, the resulting mixture being substantially anhydrous and containing less than one mole of non-volatile organic hydroxy compound per mole of titanate ester, and exposing the resulting mixture to the atmosphere, whereby the unsaturated elastomer becomes cured by the action of the said organo titanate ester.
Claim 2
Independent Claim
77 words
A method of curing an unsaturated elastomer consisting essentially of mixing 100 parts by weight of the said elastomer with from 1 to 10 parts by weight of an organo titanate ester, the resulting mixture being substantially anhydrous and containing less than one mole of non-volatile organic hydroxy compound per mole of titanate ester, and exposing the resulting mixture to the atmosphere, whereby the unsaturated elastomer becomes cured by the action of the said organo titanate ester.
Claim 3
Dependent Claim
48 words
A method as in claim 1 in which the said unsaturated elastomer is selected from the group consisting of natural rubber, synthetic cis-polyisoprene elastomer, polybutadiene elastomer, butadiene-styrene copolymer rubber, butadiene-acrylonitrile copolymer rubber, ethylene-propylene-5-ethylidene-2-norbornene terpolymer rubber having an iodine number greater than 8, polychloroprene rubber, and isobutylene-isoprene copolymer rubber.
Claim 4
Dependent Claim
37 words
A method as in claim 1 in which the said elastomer is selected from the group consisting of natural rubber, synthetic cis-polyisoprene elastomer, cis-polybutadiene elastomer and ethylene-propylene-5-ethylidene-2-norbornene terpolymer rubber having an iodine number of at least 12.
Claim 5
Dependent Claim
25 words
A method as in claim 1 in which the said organo titanate ester is selected from the group consisting of tetraalkyl titanate and tetraaryl titanate.
Claim 6
Dependent Claim
29 words
A method as in claim 1 in which the said organo titanate ester is a tetraalkyl titanate in which the alkyl group contains from 1 to 12 carbon atoms.
Claim 7
Dependent Claim
29 words
A method as in claim 1 in which the said organo titanate ester is a tetraalkyl titanate in which the alkyl group contains from 3 to 8 carbon atoms.
Claim 8
Dependent Claim
33 words
A method as in claim 1 in which the organo titanate ester and elastomer are mixed under closed, non-evaporative conditions, and the mixture is thereafter exposed to evaporative conditions to effect the cure.
Claim 9
Dependent Claim
45 words
A method as in claim 1 in which the organo titanate ester and elastomer are mixed in an inert volatile organic solvent for the elastomer containing an alcohol whereby the cure is inhibited and the solvent and alcohol are thereafter removed to effect the cure.
Claim 10
Dependent Claim
35 words
A method as in claim 1 in which the organo titanate ester and elastomer are mixed in the presence of an hydrolylic inhibiting substance, and the inhibiting substance is thereafter removed to effect the cure.
Claim 11
Dependent Claim
18 words
A method as in claim 1 in which the said organo titanate ester is the sole curative present.
Claim 12
Dependent Claim
28 words
A method as in claim 1 in which the mixture of organo titanate ester and elastomer is formed into the shape of a desired article prior to cure.
Claim 13
Dependent Claim
17 words
A method as in claim 11 in which the said shape is a thin film or sheet.
Claim 14
Dependent Claim
10 words
The cured product resulting from the method of claim 1.
Claim 15
Dependent Claim
54 words
A method as in claim 1 in which the cured product is thereafter converted back into a soluble, uncured state by immersing the cured product in a volatile organic solvent for the uncured elastomer containing a carboxylic acid, whereby the elastomer dissolves in the solvent, and thereafter recovering the thus-reclaimed elastomer from the solvent.
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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |