US4072738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming shaped articles
Assignee: Goodyear Tire and Rubber Co
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Filing: 1975-02-12
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Granted: 1978-02-07
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Expires: 1995-02-12
Abstract
Abstract This invention relates to a method of forming shaped articles utilizing liquid functional group polymers compounded with suitable compounding agents to produce mixtures of extremely viscous nature and moving these viscous mixtures to a shaping device without the entrapment of air.
Inventors
- 👤 Robert M. Pierson
- 👤 John A. Lovell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:34
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; B; B29; B29D; B29D30/00; B29D30/02; B29D30/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
In a method of forming a shaped article comprising mixing a liquid polymer containing functional end groups with a suitable compounding agent that yields a mixture capable of Newtonion flow at the mixing temperature and moving the mixture under a pressure differential of 10 to 3000 pounds per square inch to a shaper and curing, the improvement wherein the mixture is subjected to mixing in a vacuum in a high shear mixer to convert the mixture from a Newtonion to a non-Newtonion mixture at the mixing temperature, mixing a curative in the non-Newtonion mixture and moving the mixture to shaper at a viscosity at the mixing temperature expressed as 100,000 to 750,000 poises at 60° C.
Claim 2
Dependent Claim
116 words
In a method of forming a shaped article comprising mixing a liquid polymer containing functional end groups with a suitable compounding agent that yields a mixture capable of Newtonion flow at the mixing temperature and moving the mixture under a pressure differential of 10 to 3000 pounds per square inch to a shaper and curing, the improvement wherein the mixture is subjected to mixing in a vacuum in a high shear mixer to convert the mixture from a Newtonion to a non-Newtonion mixture at the mixing temperature, mixing a curative in the non-Newtonion mixture and moving the mixture to shaper at a viscosity at the mixing temperature expressed as 100,000 to 750,000 poises at 60° C.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein said polymer is a polymer of a diene or a copolymer diene and an alpha olefin having hydroxyl or carboxyl functional groups.
Claim 4
Dependent Claim
29 words
The method of claim 1 wherein one of the compounding agents is reactive with the functional groups of the polymer to give a solid polymer of increased molecular weight.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein the polymer containing functional end group is selected from the class consisting of hydroxyl terminated polydiene and an organic isocyanate.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein the polymer containing functional end groups is selected from the class consisting of hydroxyl terminated polybutadiene and hydroxyl terminated copolymer of styrene butadiene.
Claim 7
Dependent Claim
12 words
The method of claim 5 wherein the compounding agent is carbon black.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |