Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-11-05
1999-11-23
Sanders, Kriellion
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524316, 524371, 524393, 524469, 524502, C08K 509, C08K 510, C08K 512, C08K 505
Patent
active
059902132
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a flame resistant polyester resin composition which is suitably used as a potting agent for transformers and the like, and more specifically, to a flame resistant polyester resin composition that has low melt viscosity, excellent flow, improved welding strength, along with excellent impact strength, elongation, water resistance, and resistance to thermal shock.
It is an objective of this invention to provide a flame resistant polyester resin composition which is used in potting agents for electrical and electronic parts, particularly as a potting agent for transformers, which has low melt viscosity, excellent flow, improved welding strength, as well as excellent impact resistance, elongation, water resistance, and resistance to thermal [heat] shock.
SUMMARY OF THE INVENTION
The present invention, which achieves the above objectives, is a flame resistant polyester resin composition and comprises: E/x/y where E is ethylene; x is a group derived from the formula: ##STR1## wherein; R.sub.1 =C.sub.2 -C.sub.8 alkyl, R.sub.2 =H, CH.sub.3 or C.sub.2 H.sub.5 ; y is glycidyl methacrylate or glycidyl acrylate; E is 40-90% by weight; x is 10-40% by weight; and y is 0.5-20% by weight;
DETAILED DESCRIPTION
The polyester resin in this invention is selected from the group consisting of polyethylene terephthalate, polyethylene terephthalate/polybutylene terephthalate blends, polyethylene terephthalate/polybutylene terephthalate copolymers, and blends thereof, where the blends and copolymers comprise at least 70% by weight of ethylene terephthalate units and is a polyethylene terephthalate having an inherent viscosity of 0.4 in 3:1 by volume ratio of methylene chloride and trifluoroacetic acid.
The polyester resin may be replaced by a polyester matrix resin comprising polyalkylene oxide soft segment components. The polyester matrix resin comprising polyalkylene oxide soft segment components comprise 1-15 parts by weight of polyalkylene oxide soft segments of a molecular weight of 200-3,250 per 100 parts by weight of a polyester resin. The polyalkylene oxide is preferably polyethylene oxide and is incorporated in the polyethylene terephthalate polymer chain. If a polyethylene terephthalate/polybutylene terephthalate blend and/or a polyethylene terephthalate/polybutylene terephthalate copolymer is used, the polyalkylene oxide can be incorporated into the polymer by adding polyethylene terephthalate to a polybutylene terephthalate/polyalkylene oxide or by directly copolymerizing a polyethylene terephthalate, polybutylene terephthalate, and a polyalkylene oxide by directly adding the polyalkylene oxide to the polyethylene terephthalate/polybutylene terephthalate copolymer. The polyalkylene oxide has a molecular weight in the range of 200-3,250, preferably 600-1,500. Incorporating the polyalkylene oxide soft segments can accelerate the rate of crystallization.
The ethylene copolymer used in this invention is an ethylene copolymer represented by the formula E/x/y, where E is ethylene; x is a group derived from the formula: ##STR2## wherein; R.sub.1 =C.sub.2 -C.sub.8 alkyl, R.sub.2 =H, CH.sub.3 or C.sub.2 H.sub.5 ; y is glycidyl methacrylate or glycidyl acrylate; E is 40-90% by weight; x is 10-40% by weight; and y is 0.5-20% by weight. Preferably, R.sub.1 in the above formula is a C4 alkyl, R.sub.2 is H, and y is glycidyl methacrylate. It is not preferred to have a polymer content of less than 4% by weight, which fails to improve water resistance or to have a content greater than 40% by weight, which reduces heat resistance.
Brominated flame retardants which are used in this invention are known brominated flame retardants such as polydibromo styrene, polytribromo styrene, polypentabromo styrene, decabromodiphenyl, tetrabromodiphenyl, hexabromodiphenyl ether, octabromodiphenyl ether, decabromodiphenyl ether, tetrabromodiphenyl sulfide, polypentabromo benzyl acrylate, brominated phenoxy resin, epoxy terminated brominated phenoxy resin, and the like. The contents sho
E. I. Du Pont de Nemours and Company
Sanders Kriellion
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