Claims
- 1. An acrylic resin having an intrinsic viscosity [.eta.] of about 0.028 to about 0.117 l/g and a weight-average molecular weight to number-average molecular weight ratio (Mw/Mn), measured by gel permeation chromatography of about 2.3 to about 6.0, said resin comprising the polymerization product of (1) about 50 to 100 wt. % of methyl methacrylate and (2) 0 to about 50 wt. % of at least one monomer selected from the group consisting of acrylic ester monomer amd methacrylic ester monomer, said acrylic ester monomer comprising the reaction product of an alkyl alcohol having 1 to 8 carbon atoms and acrylic acid and said methacrylic ester comprising the reaction product of an alkyl alcohol having 2 to 12 carbon atoms and methacrylic acid.
- 2. An acrylic resin of claim 1, wherein the amount of methyl methacrylate (1) is in the range of from about 80 to 100 wt. % and the amount of the said monomer or monomers (2) is in the range of from 0 to about 20 wt. %.
- 3. An acrylic resin of claim 1, wherein the ratio Mw/Mn is of from 2.5 to 6.0.
- 4. An acrylic resin of claim 2, wherein the resin has a melt index of from 0.1 to 20 g/10 min, a swell of from 25 to 40%, as measured under conditions of ASTM D-1238 (230.degree. C., 3.8 kg), and a falling-weight impact strength of at least 5 kg/cm, as measured on a 50% failure energy test with 2-mm plates in accordance with JIS K-7211.
- 5. An acrylic resin of claim 4, wherein intrinsic viscosity [.eta.] is in the range of from 0.033 to 0.117 l/g; Mw/Mn is in the range of from 2.3 to 4.0, as measured by gel permeation chromatography; the fraction having molecular weight of not less than 1,000,000 is not more than 2.5%, and the fraction having molecular weight of not more than 20,000 is not more than 25%.
Priority Claims (5)
Number |
Date |
Country |
Kind |
52-134728 |
Nov 1977 |
JPX |
|
53-19514 |
Feb 1978 |
JPX |
|
53-58476 |
May 1978 |
JPX |
|
53-81438 |
Jul 1978 |
JPX |
|
54-25214 |
Mar 1979 |
JPX |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is a continuation-in-part of copending application Ser. No. 957,887 filed on Nov. 6, 1978, now U.S. Pat. No. 4,246,382.
US Referenced Citations (6)
Foreign Referenced Citations (12)
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828803 |
Feb 1960 |
GBX |
896905 |
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GBX |
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Aug 1964 |
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1202597 |
Aug 1970 |
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Apr 1972 |
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Apr 1972 |
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Jan 1973 |
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1393273 |
May 1975 |
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Non-Patent Literature Citations (2)
Entry |
CPI Abstract 60467W/37, (German Auslegeschrift No. 1,645,232). |
CPI Abstract 96002P (Swiss Patent No. 487,946). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
957887 |
Nov 1978 |
|