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Glass fiber reinforced composition of propylene polymer grafted with styrenic monomer and containing styrenic polymer
| Details |
Inventors: Kilius, Darrel E.; Eastenson, Kyle D.;
Assignee: Himont Incorporated (Wilmington, DE)
Primary Examiner: Michl; Paul R.
Assistant Examiner: Rajguru; U. K.
Attorney, Agent or Firm:
Disclosed are compositions comprising, (a) a propylene polymer material grafted in the solid state with (i) styrenic polymer and further comprising (ii) ungrafted styrenic polymer, and, optionally (iii) a vinyl comonomer and when the optional vinyl comonomer is used, (iv) styrenic-vinyl copolymer; and (b) glass fibers treated with an organic silane compound; and optionally (c) at least one rubber polymer component comprising (1) from about 0 to 100% of at least one of (i) monoalkenyl aromatic hydrocarbon-conjugated diene block copolymers, (ii) hydrogenated products of (i), or (iii) mixtures of (i) and (ii); and (2) from about 100 to 0% of an olefin copolymer rubber; and (d) a coupling agent for the glass fibers and propylene polymer material plus said rubber polymer. The compositions exhibit a preferred balance of stiffness and impact strength at moderate cost and exhibit excellent surface qualities, making them particularly useful in molded parts. |
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DETAILED DESCRIPTION OF THE INVENTION Unless otherwise specified all percentages and parts are by weight in this specification.
Component (a) of the invention, the grafted propylene polymer material, is present in the amount of from about 40 to about 95% by weight, preferably, from about 45 to about 85%, most preferably from about 50 to about 75% based on the total composition; particularly preferred is from about 50 to about 70%, depending on the balance of properties desired for the particular end use application of the blend.
When optional component (c) is used (see below), the effective concentration of (a) will be reduced since the total for all elements is 100%.
The grafted polymer of the present invention is a styrenic-monomer grafted propylene polymer material in which styrenic polymer per se is present.
Styrenic grafted propylene polymer material as used in this specification means those grafted propylene polymer materials wherein the styrenic grafting monomer (or moiety) is selected from the group consisting of styrene, an alkyl ring - substituted styrene where the alkyl is methyl or ethyl, combinations thereof wherein the alkyl ring-substituted styrene is present in an amount of from 5 to 95%, or a combination of styrene or an alkyl ring-substituted styrene with 5 to 40% of alpha-methylstyrene or alpha-methylstyrene derivatives.
Preferred grafting monomers are styrene and mixtures of styrene and alpha-methyl styrene.
In an alternative version of the grafted propylene polymer, a vinyl comonomer is used during the grafting process in addition to the styrenic monomer.
The vinyl comonomer moiety to be copolymerized or coreacted in combination with the styrenic monomer is selected from the group consisting of one or more unsaturated carboxylic acids (preferably mono- or dicarboxylic acids) and derivatives thereof, acrylonitriles and acrylates.
Examples of such monomers include acrylic acid, methacrylic acid, maleic acid, citraconic acid, maleic anhydride, citraconic anhydride, mono- and dimethyl maleate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, o-methoxyphenyl methacrylate, acrylonitrile, methacrylonitrile, glycidyl acrylate, glycidyl methacrylate and mixtures thereof; preferred are methyl methacrylate (MMA), acrylonitrile and glycidyl methacrylate
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Nonmetallic Processes 
