Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-08-13
2000-02-29
Dawson, Robert
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525107, 525529, C08F21016
Patent
active
060310545
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for producing an epoxidized organic polymer which may be used for the preparation of paints, resin modifiers, rubber modifiers, adhesives, etc. More particularly, the invention relates to a process for producing an epoxidized organic polymer in which carbon-carbon double bonds (hereinafter referred to simply as "double bonds") present in the molecular chain of the organic polymer are oxidized with the organic polymer in a dispersed or suspended state in a solvent, to thereby simplify post-treatment.
The present invention also relates to use of an epoxidized organic polymer, an epoxidized ethylenepropylene dieneterpolymer (hereinafter ethylenepropylene dieneterpolymer is referred to as EPDM), which use includes thermoplastic resin compositions having improved mechanical strength which are obtained by incorporating epoxidized EPDM and acid anhydrides into a variety of thermoplastic resins and heating the resultant mixture, as well as to primer compositions formed of EPDM, more particularly, primer compositions which are endowed with excellent adhesion to both top coats and polyolefin moldings such as polypropylene bumpers and with excellent paint storage stability.
The present invention also relates to an unvulcanized rubber composition which is formed of an epoxidized EPDM and a diene polymer and is endowed with excellent coating ability, to rubber moldings formed of the composition, and to a process for producing the moldings.
BACKGROUND ART
Hitherto, there have been known the following processes for the transformation of an organic polymer into an epoxidized organic polymer through oxidation: (1) a process in which percarboxylic acid is prepared in advance by reacting hydrogen peroxide with a lower carboxylic acid such as formic acid or acetic acid, and the percarboxylic acid is added to the reaction system as an epoxidizing agent so as to cause an epoxidizing reaction in the presence or absence of a solvent, and (2) a process in which epoxidizing reaction is caused by use of hydrogen peroxide in the presence of a catalyst such as an osmate or tungstic acid, and a solvent. These processes are both characterized in that an organic polymer to be epoxidized is dissolved in a solvent so as to carry out epoxidized reaction effectively, and the synthesized epoxidized organic polymer is recovered by desolvating treatment.
According to these processes, if the organic polymer to be epoxidized is in a liquid state or paste state, the resultant epoxidized organic polymer is also in a liquid or paste state, and therefore, the latter can be readily recovered by a desolvating procedure. However, if in a solid state, the reaction mixture is subjected to a desolvating procedure to cause the epoxidized organic polymer to precipitate in a solid state, and this precipitation and recovering operation for the epoxidized product is very difficult. Particularly when the organic polymer to be epoxidized is a rubber polymer, the synthesized epoxidized organic polymer becomes viscous to considerably reduce workability.
Under the above circumstances, a process for producing epoxidized organic polymers which involves a simplified post-treatment is desired.
In the meantime, Japanese Patent Application Laid-Open (kokai) No. 60-168750 discloses a thermoplastic polyester which contains epoxidized EPDM as an agent to improve impact resistance. Yet, improvement of impact resistance of general thermoplastic resins, including thermoplastic polyesters, is still desired.
Conventional primers for polypropylene are described, for example, in Japanese Patent Publication (kokoku) No. 63-54312, which discloses primers obtained through graft-polymerization of maleic anhydride to a chlorinated polypropylene resin; and in Japanese Patent Publication (kokoku) No. 62-21027, which discloses primers obtained through graft-polymerization of maleic anhydride to a polypropylene/ethylene copolymer. Moreover, Japanese Patent Application Laid-Open (kokai) No. 4-258643 discloses primers having impro
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Aylward D.
Dakel Chemical Industries Ltd
Dawson Robert
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