Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2001-03-19
2002-05-07
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S104000, C525S317000
Reexamination Certificate
active
06384147
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to aromatic compounds such as &agr;-methylstyrene grafted on a halogenated polymer backbone, preferably poly(vinyl chloride), wherein the graft copolymer has a single glass transition temperature. A method for preparing the graft copolymer is also disclosed. The poly(vinyl chloride)-g-poly(&agr;-methylstyrene) importantly can be utilized as a compatibilizing agent or as a high heat distortion poly(vinyl chloride) material, and the single glass transition temperature is considerably higher than that of homopolymer poly(vinyl chloride).
BACKGROUND OF THE INVENTION
Various monomers and polymers have been grafted onto halogenated polymer backbones, such as poly(vinyl chloride). The resulting grafted halogen copolymers reportedly exhibit widely varying properties.
U.S. Pat. No. 3,904,708 to Kennedy relates to an aluminum trialkyl and aluminum dialkyl monohalide catalysts which can be used to graft cationically polymerizable monomers, such as styrene, chloroprene, isobutylene, etc. to halogenated polymers with some highly reactive halogen atoms such as polyvinyl chloride),neoprene, chlorobutyl, etc.
Trivedi, Ambrose, and Altenau in
The Journal of Macromolecular Science
-
Chemistry
, A17(7), pp.1159-1168 (1982) article entitled “Synthesis and Characterization of Poly(vinyl Chloride-g-&agr;-Methylstyrene)-A New Thermoplastic Resin. 2” state that &agr;-methylstyrene was grafted on poly(vinyl chloride) using Et
2
AlCl, Et
3
Al, and Me
3
Al coinitiators and CH
2
Cl
2
as solvent or suspending agent. Grafting was reportedly shown to be feasible using both solution and suspension techniques. High grafting efficiency and low monomer conversion were reportedly obtained using Et
3
Al and Me
3
Al, while low grafting efficiency but high conversion could be obtained using Et
2
AlCl coinitiator. This paper discusses the synthesis, characterization and some mechanical properties of &agr;-methylstyrene grafted poly(vinyl chloride) and reported that two glass transition temperatures (Tg) were obtained. This suggests that the moieties of the graft copolymer are incompatible with each other.
SUMMARY OF THE INVENTION
The grafting of aromatic compounds, preferably vinyl substituted aromatics such as poly(&agr;-methylstyrene), onto halogenated backbones such as poly(vinyl chloride) is described. Unexpectedly, the graft polymer has a single glass transition temperature. The single glass transition temperature of the polyvinyl chloride)-g-poly((&agr;-methylstyrene) is considerably higher than ungrafted homopolymer poly(vinyl chloride) thus can be utilized as a high heat distortion polymer. The poly(vinyl chloride)-g-poly(&agr;-methylstyrene) can further be utilized as a compatibilizing agent for blends of poly(vinyl chloride) and poly(&agr;-methylstyrene) as well as for other polymers made from vinyl substituted aromatic monomers.
REFERENCES:
patent: 3904708 (1975-09-01), Kennedy et al.
Synthesis and Characterization of Poly(vinyl Chloride-g-&agr;-Methylstyrene)-A New Thermoplastic Resin. 2 by P.D. Trivedi et al., Journal Macromolecular Science-Chemistry, A17(7), pp. 1159-1168, 1982.
Kennedy Joseph P.
Pi Zhengjie
Asinovsky Olga
Hudak & Shunk Co. L.P.A.
Seidleck James J.
University of Akron
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