US5283289A
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Fiber-reinforced rubber composition and production process thereof and fiber-reinforced elastic product
Assignee: Ube Corp
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Filing: 1991-06-19
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Granted: 1994-02-01
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Expires: 2011-06-19
Abstract
Abstract A fiber-reinforced rubber composition capable of providing a vulcanizate having an excellent strength and modulus and a production process thereof. This fiber-reinforced rubber composition includes fine short fibers of thermoplastic polymer having (* CHEMICAL STRUCTURE *) groups buried in vulcanizable rubber. The vulcanizable rubber and the thermoplastic polymer are grafted to each other through a resol type alkylphenol formaldehyde resin precondensate or a novolak type phenol formaldehyde resin precondensate at an interface of the fiber. The ratio of the fiber to the vulcanizable rubber (A) 1 to 70 parts by weight based on 100 parts by weight of the rubber in the case of the resol type alkylphenol formaldehyde resin precondensate or (B) 1 to 100 parts by weight based on 100 parts by weight of the rubber in the case of the novolak type phenol formaldehyde resin precondensate.
Inventors
- 👤 Shinji Yamamoto
- 👤 Kouhei Kaijiri
- 👤 Kouichi Nagakura
- 👤 Denichi Oda
- 👤 Yasuo Matsumori
- 👤 Kimio Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:09
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/024; C08G81/028; C08K; C08K7/00; C08K7/02; C08L; C08L21/00; C08L51/00; C08L51/08; C08L7/00; C08L77/00; Y; Y10; Y10S; Y10S525/00; Y10S525/935
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
385 words
A process for producing a fiber-reinforced elastic product comprising the steps of: (1) preparing a compound of a fiber-reinforced rubber composition and a vulcanizing agent wherein: (A) said fiber-reinforced rubber composition comprises a vulcanizable rubber in which fine short fibers of polyamide are buried: (B) said fine short fibers of polyamide having an average diameter of 0.05 to 0.8 μm; (C) said vulcanizable rubber and said fine short fibers of polyamide are grafted to each other at an interface of said fine short fibers and said vulcanizable rubber, by a process comprising the steps of: (a) mixing at a temperature of not less than the melting point of said polyamide but not more than 270° C.: a vulcanizable rubber, a polyamide, and a resol alkylphenol formaldehyde resin precondensate, or a novolak phenol formaldehyde resin precondensate and a compound capable of producing formaldehyde upon heating together to form a mixture. (b) extruding said mixture at a temperature of not less than the melting point of said polyamide, but not more than 270° C. to form an extrudate; and (c) drawing said extrudate at a temperature of less than the melting point of said fine short fibers of polyamide; (i) the amount of said fine short fibers of polyamide in said compositions being 1 to 70 parts by weight based on 100 parts by weight of said vulcanizable rubber in the case of said resol alkylphenol formaldehyde resin precondensate and the amount of said resol alkylphenol formaldehyde precondensate being 0.2 to 2.5 parts by weight based on 100 parts by weight of said vulcanizable rubber and said fine short fibers of polyamide, when said resol alkylphenol formaldehyde precondensate is employed to join said fine short fibers of polyamide and said vulcanizable rubber or (ii) the amount of said fine short fibers being 1 to 100 parts by weight based on 100 parts by weight of said vulcanizable rubber in the case of said novolak phenol formaldehyde resin precondensate and the amount of said novolak phenol formaldehyde precondensate being 0.2 to 5.0 parts by weight based on 100 parts by weight of said vulcanizable rubber and said fine short fibers of polyamide, when said novolak phenol formaldehyde precondensate is employed to join said fine short fibers of polyamide and said vulcanizable rubber; and (2) vulcanizing the resultant compound.
Claim 2
Dependent Claim
385 words
A process for producing a fiber-reinforced elastic product comprising the steps of: (1) preparing a compound of a fiber-reinforced rubber composition and a vulcanizing agent wherein: (A) said fiber-reinforced rubber composition comprises a vulcanizable rubber in which fine short fibers of polyamide are buried: (B) said fine short fibers of polyamide having an average diameter of 0.05 to 0.8 μm; (C) said vulcanizable rubber and said fine short fibers of polyamide are grafted to each other at an interface of said fine short fibers and said vulcanizable rubber, by a process comprising the steps of: (a) mixing at a temperature of not less than the melting point of said polyamide but not more than 270° C.: a vulcanizable rubber, a polyamide, and a resol alkylphenol formaldehyde resin precondensate, or a novolak phenol formaldehyde resin precondensate and a compound capable of producing formaldehyde upon heating together to form a mixture. (b) extruding said mixture at a temperature of not less than the melting point of said polyamide, but not more than 270° C. to form an extrudate; and (c) drawing said extrudate at a temperature of less than the melting point of said fine short fibers of polyamide; (i) the amount of said fine short fibers of polyamide in said compositions being 1 to 70 parts by weight based on 100 parts by weight of said vulcanizable rubber in the case of said resol alkylphenol formaldehyde resin precondensate and the amount of said resol alkylphenol formaldehyde precondensate being 0.2 to 2.5 parts by weight based on 100 parts by weight of said vulcanizable rubber and said fine short fibers of polyamide, when said resol alkylphenol formaldehyde precondensate is employed to join said fine short fibers of polyamide and said vulcanizable rubber or (ii) the amount of said fine short fibers being 1 to 100 parts by weight based on 100 parts by weight of said vulcanizable rubber in the case of said novolak phenol formaldehyde resin precondensate and the amount of said novolak phenol formaldehyde precondensate being 0.2 to 5.0 parts by weight based on 100 parts by weight of said vulcanizable rubber and said fine short fibers of polyamide, when said novolak phenol formaldehyde precondensate is employed to join said fine short fibers of polyamide and said vulcanizable rubber; and (2) vulcanizing the resultant compound.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1, wherein said vulcanizable rubber is natural rubber, cis-1,4-polybutadiene, polyisoprene, polychloroprene, styrene-butadiene copolymer rubber, isoprene-isobutylene copolymer rubber, ethylene-propylene-unconjugated diene terpolymer or any mixture thereof.
Claim 4
Dependent Claim
14 words
A process as claimed in claim 1, wherein said vulcanizable rubber is natural rubber.
Claim 5
Dependent Claim
50 words
A process as claimed in claim 1 wherein said compound is prepared from said fiber-reinforced rubber composition, a vulcanizing agent, and additional vulcanizable rubber, the amount of said fibers being 1 to 20 parts by weight based on 100 parts by weight of the total vulcanizable rubber in said compound.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 1 wherein, the ratio of the vulcanizable rubber grafted onto the fibers compared to the fibers, is 3% to 25% by weight.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 4 wherein the graft ratio is 3% to 25% by weight.
Claim 8
Dependent Claim
30 words
A process as claimed in claim 4, wherein said vulcanizable rubber is natural rubber, cis-1,4-polybutadiene, polyisoprene, polychloroprene, styrene-butadiene copolymer rubber, isoprene-isobutylene copolymer rubber, ethylene-propylene-unconjugated diene terpolymer or any mixture thereof.
Claim 9
Dependent Claim
14 words
A process as claimed in claim 4, wherein said vulcanizable rubber is natural rubber.
Claim 10
Dependent Claim
12 words
A fiber-reinforced product prepared in accordance with the process of claim 1.
Claim 11
Dependent Claim
12 words
A fiber-reinforced product prepared in accordance with the process of claim 4.
Claim 12
Dependent Claim
231 words
A fiber-reinforced rubber composition comprising vulcanizable rubber in which fine short fibers of fiber-forming polyamide having ##STR22## groups are buried, wherein: the average diameter of said fine short fibers is 0.05 to 0.8 μm; said vulcanizable rubber and said polyamide fibers are grafted to each other through (i) a resol alkylphenol formaldehyde resin precondensate, or (ii) a novolak phenol formaldehyde resin precondensate, by heating a mixture of said vulcanizable rubber, said polyamide, and (i) the resol alkylphenol formaldehyde resin precondensate, or (ii) the novolak phenol formaldehyde resin precondensate, and a compound capable of producing formaldehyde, at a temperature of not less than the melting point of said polyamide but not more than 270° C.; the amount of said fibers in said composition is (A) 1 to 70 parts by weight based on 100 parts by weight of the rubber when the resol alkylphenol formaldehyde resin precondensate is employed, or (B) 1 to 100 parts by weight based on 100 parts by weight of the rubber when the novolak phenol formaldehyde resin precondensate is employed; the amount of the resol alkylphenol formaldehyde resin precondensate or the novolak phenol formaldehyde resin precondensate is 0.2 to 2.5 parts by weight of said resol alkylphenol formaldehyde resin precondensate or 0.2 to 5 parts by weight of said novolak phenol formaldehyde resin precondensate based on 100 parts by weight of said vulcanizable rubber and said polyamide.
Claim 13
Dependent Claim
231 words
A fiber-reinforced rubber composition comprising vulcanizable rubber in which fine short fibers of fiber-forming polyamide having ##STR22## groups are buried, wherein: the average diameter of said fine short fibers is 0.05 to 0.8 μm; said vulcanizable rubber and said polyamide fibers are grafted to each other through (i) a resol alkylphenol formaldehyde resin precondensate, or (ii) a novolak phenol formaldehyde resin precondensate, by heating a mixture of said vulcanizable rubber, said polyamide, and (i) the resol alkylphenol formaldehyde resin precondensate, or (ii) the novolak phenol formaldehyde resin precondensate, and a compound capable of producing formaldehyde, at a temperature of not less than the melting point of said polyamide but not more than 270° C.; the amount of said fibers in said composition is (A) 1 to 70 parts by weight based on 100 parts by weight of the rubber when the resol alkylphenol formaldehyde resin precondensate is employed, or (B) 1 to 100 parts by weight based on 100 parts by weight of the rubber when the novolak phenol formaldehyde resin precondensate is employed; the amount of the resol alkylphenol formaldehyde resin precondensate or the novolak phenol formaldehyde resin precondensate is 0.2 to 2.5 parts by weight of said resol alkylphenol formaldehyde resin precondensate or 0.2 to 5 parts by weight of said novolak phenol formaldehyde resin precondensate based on 100 parts by weight of said vulcanizable rubber and said polyamide.
Claim 14
Dependent Claim
30 words
A fiber-reinforced rubber composition as claimed in claim 11 wherein, the ratio of the vulcanizable rubber grafted onto the fibers compared to the fibers is 3% to 25% by weight.
Claim 15
Dependent Claim
32 words
A fiber-reinforced rubber composition as claimed in claim 11, wherein said vulcanizable rubber is natural rubber, cis-1,4-polybutadiene, polyisoprene, polychloroprene, styrene-butadiene copolymer rubber, isoprene-isobutylene copolymer rubber, ethylene-propylene-unconjugated diene terpolymer or any mixture thereof.
Claim 16
Dependent Claim
16 words
A fiber-reinforced rubber composition as claimed in claim 11, wherein said vulcanizable rubber is natural rubber.
Claim 17
Dependent Claim
10 words
A vulcanizate of the fiber-reinforced rubber composition of claim 11.
Claim 18
Dependent Claim
148 words
A process for producing a fiber-reinforced rubber composition comprising the steps of: mixing vulcanizable rubber, 1 to 100 parts by weight of fiber-forming polyamide based on 100 parts by weight of the vulcanizable rubber, said polyamide having ##STR23## groups and having a number-average molecular weight of less than 200,000, 0.2 to 5 parts by weight, based on 100 parts by weight of the total amount of the rubber and the polyamide, of a novolak phenol formaldehyde resin precondensate, and a compound capable of producing formaldehyde upon heating together at a temperature of not less than the melting point of the polyamide, but not more than 270° C.; extruding the mixture from an extruder at a temperature of not less than the melting point of the polyamide, but not more than 270° C.; and drawing an extrudate at a temperature of less than the melting point of the polyamide.
Claim 19
Dependent Claim
148 words
A process for producing a fiber-reinforced rubber composition comprising the steps of: mixing vulcanizable rubber, 1 to 100 parts by weight of fiber-forming polyamide based on 100 parts by weight of the vulcanizable rubber, said polyamide having ##STR23## groups and having a number-average molecular weight of less than 200,000, 0.2 to 5 parts by weight, based on 100 parts by weight of the total amount of the rubber and the polyamide, of a novolak phenol formaldehyde resin precondensate, and a compound capable of producing formaldehyde upon heating together at a temperature of not less than the melting point of the polyamide, but not more than 270° C.; extruding the mixture from an extruder at a temperature of not less than the melting point of the polyamide, but not more than 270° C.; and drawing an extrudate at a temperature of less than the melting point of the polyamide.
Claim 20
Dependent Claim
13 words
A fiber-reinforced rubber composition prepared in accordance with the process of claim 16.
Claim 21
Dependent Claim
22 words
A fiber-reinforced rubber composition as claimed in claim 17, wherein the melting point of said polyamide is 190° C. to 235° C.
Claim 22
Dependent Claim
89 words
A fiber-reinforced composition as claimed in claim 17, wherein the novolak phenol formaldehyde resin precondensate is a precondensate having the formula ##STR24## wherein R 1 , R 2 and R 3 are independently a hydrogen atom, or an alkyl group having 1 to 15 carbon atoms, p is 1 or 2, and q is a number of 0 to 13; a styrenated phenol-phenol-formaldehyde resin precondensate; a p-cumylphenol-formaldehyde resin precondensate; a phenyl phenol-formaldehyde resin precondensate; a lactam-bisphenol F-formaldehyde resin precondensate; a bisphenol A-formaldehyde resin precondensate; or a xylenol-formaldehyde resin precondensate.
Claim 23
Dependent Claim
40 words
A fiber-reinforced rubber composition as claimed in claim 17 wherein the compound capable of producing formaldehyde upon heating is used in an amount of 0.02 to 1 part by weight based on 100 parts by weight of the vulcanizable rubber.
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) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |