US4020039A
Expired / Lapsed
US
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Vulcanizable elastomeric compositions
Assignee: Polysar Ltd
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Filing: 1975-02-28
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Granted: 1977-04-26
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Expires: 1995-02-28
Abstract
Abstract Improved vulcanizable elastomeric compositions are provided which contain a vulcanization co-agent, the improvements being found in, separately or in combination, the scorch time and compression set and in the stress-strain and aging properties of the vulcanizates thereof.
Inventors
- 👤 John Robert Dunn
- 👤 Douglas Currie Coulthard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K3/00; C08K3/01; C08K3/011; C08K3/013; C08K5/04; C08K5/10; C08K5/101; C08K5/103; C08K5/34; C08K5/3412; C08K5/3415
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
An improved vulcanizable elastomeric composition comprising: 1. 100 parts by weight of a rubbery polymer containing at least 50 weight percent but not more than 85 weight percent of polymerized C 4 -C 6 conjugated alkadiene units; 2. from 10 parts to 200 parts by weight of filler selected from the non-black inorganic particulate fillers; 3. antioxidant; 4. a vulcanization system containing in combination a. from 0.05 to 2.5 parts by weight of sulphur, b. from 2 to 20 parts by weight of magnesium oxide, c. from 2 to 10 parts by weight of one of cadmium oxide or zinc oxide. d. one of i. 1 to 8 parts by weight of cadmium dialkyl dithiocarbamate wherein said alkyl groups contain 1 to 5 carbon atoms, or ii. 0.2 to 8 parts by weight of a tetraalkyl thiuram disulphide wherein said alkyl groups contain 1 to 4 carbon atoms; the improvement being the presence of from 0.5 to 10 parts by weight of as vulcanization co-agent N,N'-m-phenylene dimaleimide.
Claim 2
Dependent Claim
167 words
An improved vulcanizable elastomeric composition comprising: 1. 100 parts by weight of a rubbery polymer containing at least 50 weight percent but not more than 85 weight percent of polymerized C 4 -C 6 conjugated alkadiene units; 2. from 10 parts to 200 parts by weight of filler selected from the non-black inorganic particulate fillers; 3. antioxidant; 4. a vulcanization system containing in combination a. from 0.05 to 2.5 parts by weight of sulphur, b. from 2 to 20 parts by weight of magnesium oxide, c. from 2 to 10 parts by weight of one of cadmium oxide or zinc oxide. d. one of i. 1 to 8 parts by weight of cadmium dialkyl dithiocarbamate wherein said alkyl groups contain 1 to 5 carbon atoms, or ii. 0.2 to 8 parts by weight of a tetraalkyl thiuram disulphide wherein said alkyl groups contain 1 to 4 carbon atoms; the improvement being the presence of from 0.5 to 10 parts by weight of as vulcanization co-agent N,N'-m-phenylene dimaleimide.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the rubbery polymer is a butadiene/acrylonitrile copolymer.
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein the rubbery polymer is a butadiene/styrene copolymer.
Claim 5
Dependent Claim
18 words
The composition of claim 2 wherein the butadiene/acrylonitrile copolymer contains from 25 to 45 weight percent of acrylonitrile.
Claim 6
Dependent Claim
18 words
The composition of claim 3 wherein the butadiene/styrene copolymer contains from 17 to 30 weight percent of styrene.
Claim 7
Dependent Claim
25 words
The composition of claim 1 in which the filler is selected from calcium carbonate, diatomaceous earth, talc, clay, silicates, silica, platey graphite and mixtures thereof.
Claim 8
Dependent Claim
31 words
The composition of claim 6 wherein the filler is a mixture of from 10 to 50 parts by weight of platey graphite with up to 50 parts by weight of silica.
Claim 9
Dependent Claim
23 words
The composition of claim 1 in which the vulcanization co-agent is present in an amount of from 1 to 3 parts by weight.
Claim 10
Dependent Claim
19 words
The composition of claim 2 which also contains from 5 to 15 parts by weight of a polyether polythioether.
Claim 11
Dependent Claim
68 words
The composition of claim 9 wherein the vulcanization system contains in combination a. from 0.3 to 0.6 parts by weight of sulphur, b. from 5 to 10 parts by weight of magnesium oxide, c. from 4 to 6 parts by weight of cadmium oxide, and d. from 1 to 5 parts by weight of a tetraalkyl thiuram disulphide wherein said alkyl groups contain 1 to 4 carbon atoms.
References Cited (Backward Citations)
US2925407A
Cited
US3795655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |