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US4472556A
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Method for enhancing one or more mechanical properties of partially crystalline thermoplastics
Assignee: Dow Silicones Corp
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Filing: 1982-12-20
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Granted: 1984-09-18
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Expires: 2002-12-20
Abstract
Abstract A method is disclosed for enhancing at least one of the mechanical properties of a partially crystalline thermoplastic by forming a dispersion of a polydiorganosiloxane within the thermoplastic, and extending the resultant dispersion. Ultimate tensile strength, modulus, and ultimate elongation can be enhanced in comparison with the same thermoplastic with no added polydiorganosiloxane and no extension.
Inventors
- 👤 Jonathan Lipowitz
- 👤 Robert E. Kalinowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:41
CPC Classifications
C; C08; C08L; C08L101/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
190 words
A method for enhancing at least one of the mechanical properties of a partially crystalline thermoplastic, said method comprising (A) making a dispersion within said partially crystalline thermoplastic of from about 0.1% to about 5% by weight, based on the total weight of the dispersion, of a polydiorganosiloxane, said polydiorganosiloxane having the formula R 3 SiO(R 2 SiO) x SiR 3 , wherein each R is selected from the group consisting of the methyl radical, carboxyalkyl radicals, trifluoropropyl radicals, aminoalkyl radicals, phenyl radicals and polyalkylene oxide radicals, wherein said polydiorganosiloxane has a viscosity value at 25° C. of from about 1.5×10 -2 m 2 /second to about 6.0×10 -1 m 2 /second, wherein the dispersed particles within said dispersion are, on average, less than about 1.5μm in greatest dimension, and (B) forming the resultant dispersion into a shaped article such that said resultant dispersion is extended during the forming step, in at least one dimension, to an extension ratio sufficient to enhance one of the mechanical properties of said partially crystalline thermoplastic, said forming being done at a temperature lower than the crystalline melting point of said partially crystalline thermoplastic.
Claim 2
Independent Claim
190 words
A method for enhancing at least one of the mechanical properties of a partially crystalline thermoplastic, said method comprising (A) making a dispersion within said partially crystalline thermoplastic of from about 0.1% to about 5% by weight, based on the total weight of the dispersion, of a polydiorganosiloxane, said polydiorganosiloxane having the formula R 3 SiO(R 2 SiO) x SiR 3 , wherein each R is selected from the group consisting of the methyl radical, carboxyalkyl radicals, trifluoropropyl radicals, aminoalkyl radicals, phenyl radicals and polyalkylene oxide radicals, wherein said polydiorganosiloxane has a viscosity value at 25° C. of from about 1.5×10 -2 m 2 /second to about 6.0×10 -1 m 2 /second, wherein the dispersed particles within said dispersion are, on average, less than about 1.5μm in greatest dimension, and (B) forming the resultant dispersion into a shaped article such that said resultant dispersion is extended during the forming step, in at least one dimension, to an extension ratio sufficient to enhance one of the mechanical properties of said partially crystalline thermoplastic, said forming being done at a temperature lower than the crystalline melting point of said partially crystalline thermoplastic.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the forming step comprises spinning and subsequently drawing a fiber.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the forming step comprises blow molding.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the forming step comprises extruding and blowing a film.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein the forming step comprises solid phase pressure forming.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein the partially crystalline thermoplastic is a partially crystalline polyolefin and the extension ratio is greater than about 10.
Claim 8
Dependent Claim
10 words
The method of claim 6 wherein the polyolefin is polyethylene.
Claim 9
Dependent Claim
10 words
The method of claim 6 wherein the polyolefin is polypropylene.
Claim 10
Dependent Claim
22 words
The method of claim 1 wherein the partially crystalline thermoplastic is a polyester and the extension ratio is greater than about 4.5.
Claim 11
Dependent Claim
11 words
The method of claim 9 wherein the polyester is polyethylene terephtalate.
Claim 12
Dependent Claim
11 words
The method of claim 9 wherein the polyester is polybutylene terephtalate.
Claim 13
Dependent Claim
11 words
The method of claim 1 wherein R represents the methyl radical.
Claim 14
Dependent Claim
11 words
The method of claim 6 wherein R represents the methyl radical.
Claim 15
Dependent Claim
11 words
The method of claim 9 wherein R represents the methyl radical.
Claim 16
Dependent Claim
9 words
An article produced by the method of claim 1.
Claim 17
Dependent Claim
9 words
An article produced by the method of claim 6.
Claim 18
Dependent Claim
9 words
An article produced by the method of claim 9.
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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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |