Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1985-10-31
1986-11-04
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
525419, 525437, 525447, 528190, C08G 6360, C08G 6376
Patent
active
046211292
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a novel process for producing a melting-anisotropic, copolymerized polyester and, more specifically, relates to a novel process for producing a melting-anisotropic, copolymerized polyester without sublimation of starting monomer upon preparation, which the process is capable of improving the production efficiency, of producing products in the inexpensive material cost and of obtaining products with improved physical properties.
2. Background Art
A demand has been increased in recent years for those materials excellent in durability, heat-resistance and chemical-resistance irrespective of fibers, films or shaped articles. Although polyesters have now been generally adopted for wide uses in ordinary shaped articles, most of polyesters have not yet been suitable to the use requiring high strength since polyesters are inferior in the mechanical physical properties such as bending modulus. In order to improve the mechanical physical properties, while it has been known a method of blending reinforcing agents such as calcium carbonate or glass fiber, in this method the specific gravity of the material thereof increases thereby reducing the merit of light weight which is the advantage of plastics, and this method causes violent abrasion and the like to molding machines upon molding resulting in many practical problems. Melting-anisotropic polyester has become to attract one's attention in recent years as a polyester requiring no reinforcing members and suitable to the use for which a high strength is demanded.
Upon molecular design of such a melting-anisotropic polyester, a rigid molecular structure composed of paracoupling aromatic groups is basically adopted and, based thereon, means such as copolymerization, introduction of substituents to aromatic groups and partial introduction of soft ingredients has been adapted for lowering the melting point to facilitate the molding process. An alkylene therephthalate is particularly effective as the soft ingredient for improving the moldability and the alkylene terephthalate is introduced as a constitutional ingredient of a melting-anisotropic polyester, for example, in Japanese Patent Publication No. 56-18016 and The Journal of Polymer Science, Polymer Chemistry, Edition, vol. 14 (1976), page 2043, etc.
It has, however, been found that the melting-anisotropic, copolymerized polyesters prepared by these production processes have the following drawbacks.
That is, although as the raw material a polyalkylene ester such as polyethylene terephthalate, etc. and an acyloxy aromatic carboxylic acid are reacted to produce a melting-anisotropic, copolymerized polyester in these processes, since the acyloxy aromatic carboxylic acid used as the starting material is highly evaporizing (sublimating) and, further, due too the reactivity of the carboxylic acid itself in the reaction system, a relatively large amount of the monomer (the carboxylic acid) is present in the reaction system thereby causing sublimation during production to clog the pipelines in the production apparatus by the solidification of the sublimates and reduce the productivity, and as a result the composition of the resultant polymer is less stabilized. Further, since the acyloxy aromatic carboxylic acid is prepared by acylating an oxyaromatic carboxylic acid, it is more expensive than the oxyaromatic carboxylic acid. Furthermore, since the liquid crystalline polyester prepared by contacting the polyalkylene terephthlate with the acyloxy aromatic carboxylic acid has a high anisotropy in the physical property, there is a drawback that the use of the shaped articles such as fibers, films or three-dimensional structures is limited. Disclosure of the Invention
The present inventors have eagerly studied for removing the foregoing drawbacks and, as a result, have attained this invention.
Namely, this invention provides a process for producing a melting-anisotropic, copolymerized polyester containing an alkylene terephthalate ingredient, which comprises reacting 95 t
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Honma Ken
Nakamura Masahiko
Yoshimura Tamotsu
Mitsubishi Chemical Industries Limited
Phynes Lucille M.
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