US5418270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified thermoplastic elastomeric compositions
Assignee: ALPHAFLEX INDUSTRIES LLC
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Filing: 1994-04-12
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Granted: 1995-05-23
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Expires: 2014-04-12
Abstract
Abstract A composition comprises fibrillated polytetrafluoroethylene, molybdenum disulfide and a thermoplastic elastomeric material. In the composition, fibrillatable polytetrafluoroethylene is preassociated with molybdenum disulfide and combined with a thermoplastic elastomeric copolymer in relative amounts from as low as about 2 parts per hundred rubber to as high as about 12 parts per hundred rubber, with the balance thermoplastic elastomeric copolymer and filler. The composition can further include an unpolymerized polytetrafluoroethylene binder residue of the fibrillated polytetrafluoroethylene.
Inventors
- 👤 William E. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:08
CPC Classifications
C; C08; C08L; C08L53/00; C08L53/02; C08L53/025
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
30 words
A composition comprising: (a) about 2 percent to about 12 percent of a combination of fibrillatable polytetrafluoroethylene and molybdenum sulfide; and (b) the balance of a thermoplastic elastomeric block copolymer.
Claim 2
Dependent Claim
30 words
A composition comprising: (a) about 2 percent to about 12 percent of a combination of fibrillatable polytetrafluoroethylene and molybdenum sulfide; and (b) the balance of a thermoplastic elastomeric block copolymer.
Claim 3
Dependent Claim
32 words
The composition of claim 1 wherein the thermoplastic elastomeric block compolymer comprises a two phase copolymer of two incompatible polymers comprising a thermoplastic end block polymer and an elastomeric mid block polymer.
Claim 4
Dependent Claim
15 words
The composition of claim 2 wherein the thermoplastic end block polymer is a styrene polymer.
Claim 5
Dependent Claim
25 words
The composition of claim 2 wherein the elastomeric mid block polymer is a polymer selected from a group consisting of polybutadiene, polyisoprene and poly (ethylene-butylene).
Claim 6
Dependent Claim
15 words
The composition of claim 2 wherein the elastomeric mid block polymer comprises an unsaturated polymer.
Claim 7
Dependent Claim
15 words
The composition of claim 2 wherein the elastomeric mid block polymer is a saturated polymer.
Claim 8
Dependent Claim
30 words
The composition of claim 1 wherein the ratio of fibrillated polytetrafluoroethylene to molybdenum disulfide is in a range of about 3 to 1 to about 6 to 1 by weight.
Claim 9
Dependent Claim
16 words
The composition of claim 7 further comprising an unpolymerized polytetrafluoroethylene binder residue of the fibrillated polytetrafluoroethylene.
Claim 10
Dependent Claim
40 words
The composition of claim 7 wherein said thermoplastic elastomeric block copolymer is a styrene-butadiene copolymer, and said effective amount of fibrillated polytetrafluoroethylene and molybdenum disulfide comprises from about 2 to about 12 parts per 100 parts by weight of copolymer.
Claim 11
Dependent Claim
40 words
The composition of claim 7 wherein said thermoplastic elastomeric block copolymer is a styrene-isoprene copolymer, and said effective amount of fibrillated polytetrafluoroethylene and molybdenum disulfide comprises from about 2 to about 12 parts per 100 parts by weight of copolymer.
Claim 12
Dependent Claim
40 words
The composition of claim 7 wherein said thermoplastic elastomeric block copolymer is a styrene-ethylene-butadiene copolymer, and said effective amount of fibrillated polytetrafluoroethylene and molybdenum disulfide comprises from about 2 to about 12 parts per 100 parts by weight of copolymer.
Claim 13
Dependent Claim
16 words
The composition of claim 1 wherein the thermoplastic elastomeric block copolymer includes a styrene-isoprene block copolymer.
Claim 14
Dependent Claim
57 words
A composition resulting from a method, comprising: mixing together a thermoplastic elastomeric block copolymer, fibrillatable polytetrafluoroethylene in an amount in a range from about 2 parts per hundred rubber to about 12 parts per hundred rubber and an amount of molybdenum disulfide that is effective to uniformly incorporate the particulate polytetrafluoroethylene in the thermoplastic elastomeric block copolymer.
Claim 15
Dependent Claim
57 words
A composition resulting from a method, comprising: mixing together a thermoplastic elastomeric block copolymer, fibrillatable polytetrafluoroethylene in an amount in a range from about 2 parts per hundred rubber to about 12 parts per hundred rubber and an amount of molybdenum disulfide that is effective to uniformly incorporate the particulate polytetrafluoroethylene in the thermoplastic elastomeric block copolymer.
Claim 16
Dependent Claim
16 words
The composition resulting from the further steps of molding and curing the composition of claim 13.
Claim 17
Dependent Claim
49 words
The composition of claim 13 wherein the fibrillatable polytetrafluoroethylene lies in the range of 2 percent by weight to 12 percent by weight and the amount of molybdenum disulfide lies in a range of from about 0.17 parts per part to about 0.3 parts per part of fibrillatable polytetrafluoroethylene.
Claim 18
Dependent Claim
10 words
The composition of claim 13 further comprising non-fibrillated particulate material.
Claim 19
Dependent Claim
44 words
A composition resulting from the steps of: mixing together a thermoplastic elastomeric block copolymer and a fibrillatable polytetrafluoroethylene with an amount of molybdenum disulfide to effect uniform mixing of the polytetrafluoroethylene in the elastomer; and curing the mixture to obtain a recoverable elastic solid.
Claim 20
Dependent Claim
44 words
A composition resulting from the steps of: mixing together a thermoplastic elastomeric block copolymer and a fibrillatable polytetrafluoroethylene with an amount of molybdenum disulfide to effect uniform mixing of the polytetrafluoroethylene in the elastomer; and curing the mixture to obtain a recoverable elastic solid.
Claim 21
Dependent Claim
37 words
The composition of claim 17 wherein the fibrillatable polytetrafluoroethylene includes from about 2 parts per hundred rubber to about 12 parts per hundred rubber of fibrillated polytetrafluoroethylene and up to about an equal amount of molybdenum disulfide.
Claim 22
Independent Claim
66 words
A method of incorporating polytetrafluoroethylene material into a thermoplastic elastomer, comprising: placing together a quantity of thermoplastic elastomeric block copolymer and a quantity of particulate polytetrafluoroethylene material, adding an effective amount of molybdenum disulfide, and mechanically mixing together the thermoplastic elastomeric block copolymer, particulate polytetrafluoroethylene material, and the molybdenum disulfide to obtain a uniform dispersion of the particulate polytetrafluoroethylene material in the thermoplastic elastomeric block copolymer.
Claim 23
Independent Claim
66 words
A method of incorporating polytetrafluoroethylene material into a thermoplastic elastomer, comprising: placing together a quantity of thermoplastic elastomeric block copolymer and a quantity of particulate polytetrafluoroethylene material, adding an effective amount of molybdenum disulfide, and mechanically mixing together the thermoplastic elastomeric block copolymer, particulate polytetrafluoroethylene material, and the molybdenum disulfide to obtain a uniform dispersion of the particulate polytetrafluoroethylene material in the thermoplastic elastomeric block copolymer.
Claim 24
Dependent Claim
23 words
The method of claim 19 wherein the particulate polytetrafluoroethylene is capable of fibrillation and is fibrillated as it is mixed in the elastomer.
Claim 25
Dependent Claim
40 words
A composition, comprising: a solid matrix of cured thermoplastic elastomeric block copolymer, polytetrafluoroethylene and molybdenum disulfide in which at least a portion of said polytetrafluoroethylene is fibrillated and is uniformly dispersed in the thermoplastic elastomer matrix with particulate molybdenum disulfide.
Claim 26
Dependent Claim
40 words
A composition, comprising: a solid matrix of cured thermoplastic elastomeric block copolymer, polytetrafluoroethylene and molybdenum disulfide in which at least a portion of said polytetrafluoroethylene is fibrillated and is uniformly dispersed in the thermoplastic elastomer matrix with particulate molybdenum disulfide.
Claim 27
Dependent Claim
20 words
The composition of claim 21 wherein the polytetrafluoroethylene particles comprise at least 25 percent by weight of the total composition.
Claim 28
Dependent Claim
38 words
The composition of claim 21 wherein the fibrillatable polytetrafluoroethylene is present in an amount of at least about 2 parts per hundred rubber and the total amount of polytetrafluoroethylene is less than about 12 parts per hundred rubber.
Claim 29
Dependent Claim
25 words
The composition of claim 23 wherein the polytetrafluoroethylene particles comprise about 25 percent by weight to about 50 percent by weight of the total composition.
Claim 30
Dependent Claim
16 words
The composition of claim 1 wherein the thermoplastic elastomeric block copolymer includes a styrene-butadiene block copolymer.
Claim 31
Dependent Claim
14 words
The composition of claim 1 wherein the thermoplastic elastomeric block copolymer comprises a terpolymer.
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