US4379095A
Expired / Lapsed
US
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Method for reducing the mechanical stability of natural rubber latex
Assignee: Bridgestone Firestone Inc
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Filing: 1982-02-17
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Granted: 1983-04-05
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Expires: 2002-02-17
Abstract
Abstract A method is provided for the mechanical destabilization of natural rubber latex by the addition of a nonionic polyol block copolymer surfactant. Reducing the mechanical stability allows the natural rubber latex composition to form better quick-break adhesives.
Inventors
- 👤 Richard C. Oldack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:16
CPC Classifications
C; C08; C08L; C08L7/00; C08L7/02; C08L53/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A method for reducing the mechanical and chemical stability of natural rubber latex comprising the step of: adding to the latex a nonionic polyol block copolymer surfactant selected from the group consisting of block polymers of propylene oxide sandwiched between block polymers of ethylene oxide in an amount of about 0.5 parts per 100 parts of rubber and block copolymers of ethylene oxide and propylene oxide bonded to ethylenediamine in an amount of from about 0.1 to about 0.5 parts, per 100 parts of rubber, and having a cloud point of less than 100° C., in order to reduce the amount of pressure necessary for the latex to bond to substances upon which it is applied.
Claim 2
Independent Claim
116 words
A method for reducing the mechanical and chemical stability of natural rubber latex comprising the step of: adding to the latex a nonionic polyol block copolymer surfactant selected from the group consisting of block polymers of propylene oxide sandwiched between block polymers of ethylene oxide in an amount of about 0.5 parts per 100 parts of rubber and block copolymers of ethylene oxide and propylene oxide bonded to ethylenediamine in an amount of from about 0.1 to about 0.5 parts, per 100 parts of rubber, and having a cloud point of less than 100° C., in order to reduce the amount of pressure necessary for the latex to bond to substances upon which it is applied.
Claim 3
Independent Claim
52 words
A method for reducing the mechanical and chemical stability of natural rubber latex comprising the step of: adding to the latex about 0.5 part, per 100 parts of rubber, of a nonionic polyol block copolymer surfactant comprising poly(oxyethylene-b-oxypropylene-b-oxyethylene), having an average molecular weight of 3800 and a cloud point of 15° C.
Claim 4
Independent Claim
52 words
A method for reducing the mechanical and chemical stability of natural rubber latex comprising the step of: adding to the latex about 0.5 part, per 100 parts of rubber, of a nonionic polyol block copolymer surfactant comprising poly(oxyethylene-b-oxypropylene-b-oxyethylene), having an average molecular weight of 3800 and a cloud point of 15° C.
Claim 5
Independent Claim
69 words
A method for reducing the mechanical and chemical stability of natural rubber latex comprising the step of: adding to the latex from about 0.1 to about 0.5 parts, per 100 parts of rubber, of a nonionic polyol block copolymer surfactant comprising four poly(oxyethylene-b-oxypropylene) copolymers bonded to the nitrogen atoms of ethylenediamine via said polypropylene blocks, having an average molecular weight of 4000 and a cloud point of 27° C.
Claim 6
Independent Claim
69 words
A method for reducing the mechanical and chemical stability of natural rubber latex comprising the step of: adding to the latex from about 0.1 to about 0.5 parts, per 100 parts of rubber, of a nonionic polyol block copolymer surfactant comprising four poly(oxyethylene-b-oxypropylene) copolymers bonded to the nitrogen atoms of ethylenediamine via said polypropylene blocks, having an average molecular weight of 4000 and a cloud point of 27° C.
Claim 7
Independent Claim
69 words
A method for reducing the mechanical and chemical stability of natural rubber latex comprising the step of: adding to the latex from about 0.1 to about 0.5 parts, per 100 parts of rubber, of a nonionic polyol block copolymer surfactant comprising four poly(oxyethylene-b-oxypropylene) copolymers bonded to the nitrogen atoms of ethylenediamine via said polypropylene blocks, having an average molecular weight of 4750 and a cloud point of 20° C.
Claim 8
Independent Claim
69 words
A method for reducing the mechanical and chemical stability of natural rubber latex comprising the step of: adding to the latex from about 0.1 to about 0.5 parts, per 100 parts of rubber, of a nonionic polyol block copolymer surfactant comprising four poly(oxyethylene-b-oxypropylene) copolymers bonded to the nitrogen atoms of ethylenediamine via said polypropylene blocks, having an average molecular weight of 4750 and a cloud point of 20° C.
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) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |