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| Thermoplastic olefin resin composition and laminated film or sheet thereof |
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| Blends of a propylene/.alpha.-olefin copolymer with isotactic prolypropylene |
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| Acrylic multilayer polymer powder |
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| Process for extrusion |
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| Olefine thermoplastic elastomer sheet |
| OF THE INVENTION The present invention is described in more detail. First, the olefin ... |
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| Coextruded chewing gum containing a soft non-SBR gum core portion |
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Polyvinylidene fluoride weather resistant coating compositions including polymethyl methacrylate
| Details |
Inventors: Lin, Shiow-Ching; Kamsler, Craig; Argasinski, Karol;
Assignee: Ausimont USA, Inc. (Thorofare, NJ)
Primary Examiner: Cain; Edward J.
Assistant Examiner:
Attorney, Agent or Firm: Norris McLaughlin & Marcus
A weather resistant coating composition comprising a miscible polymer blend of highly crystalline polyvinylidene fluoride polymer and polyalkyl methacrylate, such as PVDF and PMMA. The miscible blend comprises from about 50 weight percent to about 90 weight percent polymer comprising polyvinylidene fluoride and from about 10 weight percent to about 50 weight percent polyalkyl methacrylate. The polyalkyl methacrylate having a molecular weight within the range of about 25,000 grams per mole to about 200,000 grams per mole. The crystallinity of the polyvinylidene fluoride polymer is about 20% to about 70%. The weather resistant coating has excellent and unexpected physical characteristics, including solvent resistance and gloss retention. |
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DETAILED DESCRIPTION OF THE PREFERRED EMODIMENT In the following description, the invention is described in terms of a preferred embodiment, but such description should not limit the scope of the invention, which is set forth in the accompanying claims.
PVDF is compatible and/or miscible with a wide range of polymers such as polymethacrylates, polyacrylates and polyvinyl acetates containing C.
dbd.
O groups in the ester, amide or ketone forms.
The compatibility and/or miscibility, in part, arises from the interaction between the C.
dbd.
O bonds of the polymethacrylates, polyacrylates and polyvinyl acetates, as the case may be, and the CH.
sub.
2 groups of the vinylidene fluoride.
PVDF is particularly useful for the weather resistant coating compositions because the photo-oxidative resistance and the high crystallinity of the PVDF provides strength to the composition and the salvation process employed with the invention provides a coating composition wherein the PVDF in the blend has high crystallinity, that is from about 20% to about 70%.
PVDF with a melt viscosity of about 1 kpoise to about 80 kpoise at 232.
degree.
and a shear rate of about 100 sec.
sup.
-1 can be used to obtain a PVDF containing composition capable of use as a coating material of the invention.
In this embodiment, as well as other embodiments of the invention, no flow promoter is necessary for the coating composition.
PMMA can be used as secondary polymer for PVDF coating applications.
PMMA has excellent miscibility with PVDF and provides good heat resistance, mechanical properties, weatherability and optical clarity.
It has been discovered that blending PVDF and PMMA with a molecular weight between about 25,000 grams per mole and about 200,000 grams per mole; preferably between about 100,000 grams per mole and about 150,000 grams per mole; obtains a miscible blend and provides for better interaction between the PVDF and PMMA and more thorough blending thus, combined with the desirable properties related to the highly crystalline structure of the PVDF, provides a coating composition with unexpected weather resistance
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