US3965053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed polyolefin foils
Assignee: Bayer AG
•
Filing: 1975-01-09
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Granted: 1976-06-22
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Expires: 1995-01-09
Abstract
Abstract A process for the continuous production of a foamed foil from a polymer based on an α,β-monolefinically unsaturated monomer wherein 0.05 to 0.2 % by weight of a diamide obtained by reacting an aliphatic diamine and at least one aliphatic monocarboxylic acid having at least 4 carbon atoms is added to the solid or molten polymer in addition to the chemical blowing agent before or while the polymer is processed.
Inventors
- 👤 Frank Kleiner
- 👤 Wolfgang Becker
- 👤 Karl Heinz Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:09
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0028; C08J9/04; C08J9/06; C08J9/10; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
A process for the continuous production of a foamed foil from a polymer based on an α,β -monoolefinically unsaturated monomer, said process comprising adding 0.05-0.2% by weight, based on the polymer, of a diamide of the formula R.sup.1 --CO--NH--(CH.sub.2).sub.n --NH--CO--R.sup.2 to said polymer in the solid or molten state either before or during foamed foil production by a chemical blowing agent, said R 1 and R 2 , which may be the same or different, being alkyl or alkenyl having 4 to 20 carbon atoms and n being an integer of from 2 to 6.
Claim 2
Dependent Claim
95 words
A process for the continuous production of a foamed foil from a polymer based on an α,β -monoolefinically unsaturated monomer, said process comprising adding 0.05-0.2% by weight, based on the polymer, of a diamide of the formula R.sup.1 --CO--NH--(CH.sub.2).sub.n --NH--CO--R.sup.2 to said polymer in the solid or molten state either before or during foamed foil production by a chemical blowing agent, said R 1 and R 2 , which may be the same or different, being alkyl or alkenyl having 4 to 20 carbon atoms and n being an integer of from 2 to 6.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, wherein from 0.08 to 0.15 % by weight of diamide is added to the polymer.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the polymer is a polymer of an olefin containing 2 to 4 carbon atoms.
Claim 5
Dependent Claim
31 words
A process as claimed in claim 1, wherein the polymer is high or low pressure polyethylene or a copolymer of ethylene and up to 20 % by weight of vinyl ester.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 4, wherein the polymer is a copolymer of ethylene and up to 10 % by weight of vinyl acetate.
Claim 7
Dependent Claim
19 words
A process as claimed in claim 1, wherein the chemical blowing agent has a decomposition point of about 190°C.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 6, wherein the chemical blowing agent is azodicarbonamide or a dinitrosopentamethylene tetramine.
Claim 9
Dependent Claim
29 words
A process as claimed in claim 1, wherein the chemical blowing agent is used in a concentration of from 0.1 to 2 % by weight based on the polymer.
Claim 10
Dependent Claim
12 words
A foamed foil produced by a process as claimed in claim 1.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |