Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-06-11
1998-06-30
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 91, 525 92F, 525177, C08L 6702
Patent
active
057735174
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for producing thermoplastic resin compositions. The thermoplastic resin compositions obtainable by the process of the present invention have excellent compatibility with a variety of polymers. The compositions are therefore useful as resin improving agents, e.g. compatibility improving agents that can make compatible different polymers, which are originally incompatible with each other, and give homogeneous polymer alloys therefrom. The compositions are also useful as quality improving agents for resins to improve various properties of other polymers, such as impact strength, tensile strength, elongation, heat resistance, paintability, weather resistance, elasticity, resilience, flowability, dimensional stability and chemical resistance.
BACKGROUND ART
Technology for modifying existing polymers is more advantageous than that for developing new polymers based on molecular design, because of far less cost and shorter time required. The modification technology is therefore under vigorous research in the fields of automobile parts, electric and electronic material parts and the like. This technology mainly uses modification agents, and there have been desired better resin improving agents, such as compati- bility improving agents used for producing polymer alloys comprising at least two polymer components and quality improving agents for improving specific properties of polymers.
However, there have been available very few resin modifying agents having good compatibility with a variety of polymers. Attempts to modify, in particular, a polyester resins (or polymer alloys containing a polyester as one costituent), have produced no sufficient results, since such attempts have encountered problems such as nonuniformity and inter-phase delamination due to poor compatibility.
To solve these problems, for example U.S. Pat. Nos. 4,923,956 and 4,839,423 propose use of a polystyrene to the side chain of which ethylglycidyl methacrylate has added or a polymethacrylate to the side chains of which ethylglycidyl methacrylate has added. However, these modifying agents are not very effective for polyester resins and, moreover, usually require a complex synthesis process.
Japanese Patent Application Laid-open No. 199127/1990 proposes, as a modifying agent for polyester resins, a reaction product of an aromatic vinyl polymer having carboxyl group on at least one end thereof and a polymer being compatible with polyesters and having hydroxyl group on at least one end thereof. The Application also proposes a reaction product of an aromatic vinyl polymer having hydroxyl group or amino group on at least one end thereof and a polymer being compatible with polyesters and having carboxyl group on at least one end thereof. The present inventors made the following test. That is, according to the process described in Example of Japanese Patent Application Laid-open No. 199127/1990, polybutylene terephthalate was, under melting condition, mixed with a polystyrene having hydroxyl group on one end thereof and dehydration was conducted. The obtained reaction product was evaluated for the effect of improving compatibility for a polybutylene terephthalate/polystyrene polymer alloy. No sufficient improvement of compatibility was then observed.
Japanese Patent Application Laid-open No. 161043/1989 discloses a process for producing polyester resin compositions, which comprises melt kneading polyethylene terephthalate with polyethylene and/or a modified polyethylene having side chain-carboxyl groups and then solid phase polymerizing the kneaded product. EP 333414 discloses a process for producing improved thermoplastic polyester resins, which comprises melt kneading a thermoplastic polyester with a modified olefin comprising an olefin graft-polymerized with an unsaturated carboxylic acid and then heating the mixture in a solid state. The products obtained by these processes, each being a graft copolymer, have insufficient compatibility with other polymers.
U.S. Pat. No. 3,723,574 disclo
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Kashimura Tsugunori
Masuda Haruhisa
Oku Takashi
Kuraray Co. Ltd.
Short Patricia A.
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