Patent US4710541A successfully refreshed from Google Patents.
US4710541A
Expired / Lapsed
US
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Process for molding and vulcanizing rubber products
Assignee: Bridgestone Corp
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Filing: 1985-10-22
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Granted: 1987-12-01
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Expires: 2005-10-22
Abstract
Abstract An improved process for molding and vulcanizing rubber products using a curing bladder, characterized in that the bladder is one which is made of a rubber compound containing (A) organic rubber and (B) polyorganosiloxane, the ratio of (A)/(B) being 95/5 to 5/95, or the bladder is one which is produced by surface treating (A) organic rubber with a silicone composition containing (A) organic rubber and (B) polyorganosiloxane, said polyorganosiloxane comprising at least two monovalent substituted or unsubstituted hydrocarbon groups having five or more carbon atoms and a C═C double bond connected to the silicon atom through at least one carbon atom, and having a degree of polymerization greater than 20.
Inventors
- 👤 Seisuke Tomita
- 👤 Takatsugu Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:00
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/0601; B29D30/0654; B29C; B29C43/00; B29C43/32; B29C43/36; B29C43/3642; C; C08; C08L; C08L21/00; C08L23/00; C08L23/02; C08L83/00; C08L83/04; B29D2030/0655; B29K; B29K2883/00; B29L; B29L2030/00; C08G; C08G77/00; C08G77/04; C08G77/20; C08G77/22; C08G77/24; C08G77/28; C08G77/70; C08L11/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1386; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
A curing bladder, comprising: a rubber compound containing (A) an organic rubber and (B) a polyorganosiloxane, the ratio of (A)/(B) being 95/5 to 5/95, said polyorganosiloxane (B) comprising at least two monovalent substituted or unsubstituted hydrocarbon groups having five or more carbon atoms and 0.05 to 20 mol % of a C═C double bond connected to the silicon atom through at least one carbon atom, and having a degree of polymerization greater than 20.
Claim 2
Dependent Claim
74 words
A curing bladder, comprising: a rubber compound containing (A) an organic rubber and (B) a polyorganosiloxane, the ratio of (A)/(B) being 95/5 to 5/95, said polyorganosiloxane (B) comprising at least two monovalent substituted or unsubstituted hydrocarbon groups having five or more carbon atoms and 0.05 to 20 mol % of a C═C double bond connected to the silicon atom through at least one carbon atom, and having a degree of polymerization greater than 20.
Claim 3
Dependent Claim
50 words
The curing bladder as claimed in claim 1, wherein the organic rubber is selected from the group consisting of natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, acrylonitrile-butadiene rubber, ethylene-α-olefin rubber, butyl rubber, halogenated butyl rubber, fluororubber, acrylic rubber, epichlorohydrin rubber, ethylene-vinyl acetate copolymer rubber, ethylene-propylene rubber and ethylene-propylene-diene rubber.
Claim 4
Dependent Claim
45 words
The curing bladder as claimed in claim 1, wherein the polyorganosiloxane further comprises organic groups connected to the silicon atom and wherein the organic groups are selected from the group consisting of alkyl groups, aryl groups, aralkyl groups, halogenated hydrocarbon groups and aliphatic unsaturated groups.
Claim 5
Dependent Claim
21 words
The curing bladder as claimed in claim 3, wherein more than 90 mol % of the organic groups are methyl groups.
Claim 6
Dependent Claim
33 words
The curing bladder as claimed in claim 1, wherein the hydrocarbon groups in the polyorganosiloxane are selected from the group consisting of alkylidenenorbornyl groups, cyclopentenyl groups, 4-pentenyl groups, 4-hexenyl groups, and cyclooctenyl groups.
Claim 7
Dependent Claim
19 words
The curing bladder as claimed in claim 1, wherein the polyorganosiloxane further comprises vinyl groups or aliphatic unsaturated groups.
Claim 8
Dependent Claim
17 words
The curing bladder as claimed in claim 1, wherein the degree of polymerization is greater than 1,000.
Claim 9
Dependent Claim
39 words
The curing bladder as claimed in claim 1, wherein the monovalent hydrocarbon group having five or more carbon atoms and a C═C double bond connected to the silicon atom through at least one carbon atom is an alkylidenenorbornyl group.
Claim 10
Dependent Claim
68 words
The curing bladder as claimed in claim 1, wherein the polyorganosiloxane has 1.9 to 2.1 organic groups per silicon atom, with the monovalent hydrocarbon group having five or more carbon atoms and a C═C double bond connected to the silicon atom through at least one carbon atom accounting for 0.05 to 20 mol % in the total organic groups, and has a degree of polymerization greater than 1000.
Claim 11
Dependent Claim
20 words
The curing bladder as claimed in claim 9, wherein the polyorganosiloxane has 1.98 to 1,002 organic groups per silicon atom.
Claim 12
Dependent Claim
30 words
The curing bladder as claimed in claim 1, wherein the polyorganosiloxane is selected from the group consisting of vinyl group-containing polyorganosiloxane, mercapto group-containing polyorganosiloxane, (methyl acryloyl group-containing polyorganosiloxane and polydimethylsiloxane.
Claim 13
Dependent Claim
17 words
The curing bladder as claimed in claim 1, wherein the ratio of (A)/(B) is 80/20 to 30/70.
Claim 14
Dependent Claim
138 words
The curing bladder as claimed in claim 1, wherein the curing bladder is made of a rubber compound containing (A) an organic rubber and (B) a polyorganosiloxane composed of (1) 5 to 100% by weight of polyorganosiloxane comprising at least two monovalent substituted or unsubstituted hydrocarbon groups having five or more carbon atoms and a C═C double bond connected to the silicon atom through at least one carbon atom and having a degree of polymerization greater than 20, and (2) 95 to 0% by weight of polyorganosiloxane having substantially no monovalent substituted or unsubstituted hydrocarbon groups groups having five or more carbon atoms and a C═C double bond connected to the silicon atom through at least one carbon atom but comprising other crosslinkable monovalent substituted or unsubstituted hydrocarbon groups, and having a degree of polymerization greater than 20.
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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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |