US4074033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical milling of neoprene rubber
Assignee: Pratt and Lambert Inc
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Filing: 1976-07-09
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Granted: 1978-02-14
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Expires: 1996-07-09
Abstract
Abstract A process for improving the processability of high molecular weight neoprene polymers which comprises treating a solution of said polymers in an organic solvent with an organic peroxide at room temperature in the presence of oxygen to reduce the molecular weight of said neoprene and lower the viscosity of said solution.
Inventors
- 👤 Leon E. Wolinski
- 👤 Richard G. Riebling
- 👤 John H. Edholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:28
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/04; C08C19/08; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A process for improving the processability of a high molecular weight neoprene polymer which comprises treating a solution of said polymer in an organic solvent with an organic peroxide at room temperature in the presence of oxygen to reduce the molecular weight of said neoprene and lower the viscosity of said solution.
Claim 2
Dependent Claim
52 words
A process for improving the processability of a high molecular weight neoprene polymer which comprises treating a solution of said polymer in an organic solvent with an organic peroxide at room temperature in the presence of oxygen to reduce the molecular weight of said neoprene and lower the viscosity of said solution.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein said organic peroxide is selected from the group consisting of benzoyl peroxide, tert-butyl peroxide, acetyl peroxide, methyl ethyl ketone peroxide, lauroyl peroxide, and tert-butyl perbenzoate.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein said organic solvent is selected from the group consisting of acetone, methyl ethyl ketone, ethyl acetate, toluene, hexane, petroleum ether and mixtures thereof.
Claim 5
Dependent Claim
64 words
The process of claim 1 wherein an accelerator for said organic peroxide, which accelerator is selected from the group consisting of N,N-dimethyl-p-toluidine, N,N-dimethylaniline, N,N-diethylaniline, triethyl amine, cobalt naphthenate, manganese naphthenate and transition metal salts other than cobalt naphthenate, the amount of metal in the naphthenates and transition metal salts present being in the order of about 0.0005 gms per 100 gms of neoprene polymer.
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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |