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
1993-06-02
1994-10-04
Schofer, Joseph L.
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...
525 71, C08J 302
Patent
active
053527283
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for the preparation of impact resistant and high gloss thermoplastic resin. More particularly, it relates to a process for the preparation of thermoplastic resin which is improved in both impact resistance and surface gloss by using rubber latices having a high percentage of gel content and different rubber particle diameters.
2. Description of the Related Arts
Up to date, it has been well known that a good processible and impact resistant thermoplastic resin may be produced by means of grafting a mixture of vinyl aromatic monomers such as styrene, .alpha.-methyl styrene, etc. and other monomers, which can be copolymerized with it, into a rubber modified resin.
The rubber latex must contain a low percentage of gel content in order to produce a good impact resistant thermoplastic resin. However, the thermoplastic resin containing low gel content rubber particles has a drawback of poor surface gloss. On the other hand, when the rubber latex contains a high percentage of gel content in order to improve surface gloss, the impact strength is lowered. Also, the amount of small particles in the resin may be increased in order to improve a surface gloss. However, this method has drawbacks in that the impact strength and the melt flow rate of the thermoplastic resin are lowered.
Accordingly, it is necessary to provide a process for the preparation of the thermoplastic resin of which both impact resistence and high gloss are improved.
The present inventors investigated a process assiduously to improve the above-mentioned problems.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a process for the preparation of a thermoplastic resin which is improved in both impact resistance and surface gloss by using rubber latices having a high percentage of gel content and different rubber particle diameters.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is a process for the preparation of impact resistant and high gloss thermoplastic resin, which comprises blending graft polymer latex (A) and graft polymer latex (B), wherein the graft polymer (A) having 40,000 to 120,000 of weight average molecular weight, Mw, and 60 to 120% of the degree of grafting is produced by grafting a mixture of monomers onto 10 to 40 parts by weight of rubber latices which contain small particles, and wherein the graft polymer latex (B) having 40,000 to 120,000 of weight average molecular weight, Mw, and 25 to 45% of the degree of grafting is produced by grafting a mixture of monomers onto 40 to 80 parts by weight of rubber latices which contain large particles.
In more detail, for the first step, 60 to 90 parts by weight of the mixture of monomers are grafted onto 10 to 40 parts by weight (solid base) of rubber latices containing small particles, wherein the amount of gel content in the rubber latices is 70 to 95% by weight and the average particle diameter is 0.03 to 0.02 .mu.m. The weight parts of the rubber latices are based on the solid content.
In the second step, the rubber latices which contain large particles having a diameter of 0.25 to 1.0 .mu.m, is produced by agglomerating the rubber latices containing small particles used in the first step. The degree of grafting of the graft polymer (B) is 25 to 45%, and the molecular weight of the grafted polymer is 40,000 to 120,000.
Next, in the third step, the final product is produced by blending the two kinds of rubber latices which differ in both particle diameter and degree of grafting, wherein the ratio of large particles to small particles in a total rubber content is 95/5 to 70/30 by weight. The rubber content in the final product is 35 to 55% by weight.
The mixture of monomers used in this present invention include vinyl aromatic monomers, or one or more than two of the other vinyl monomers which can be copolymerized with them. The examples of the former are styrene, .alpha.-methylstyrene, halostyrenes such as o-chlorostyrene or p-chlorostyrene, dibro
REFERENCES:
patent: 4753988 (1988-06-01), Henton et al.
Kim Dong R.
Lee Chan H.
Lucky Ltd.
Mulcahy Peter D.
Schofer Joseph L.
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