Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1985-08-20
1987-05-05
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528292, 528302, 528326, C08G 6908, C08G 6914, C08G 6344
Patent
active
046634282
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to colorless polyesteramides having excellent heat resistance and water resistance which are obtained from at least one polyamide-forming compound selected from the group consisting of amino carboxylic acids, lactams and nylon salts, a dicarboxylic acid and a polycaprolactonediol. The polyesteramides of the invention are useful particularly for the production of parts of electric appliances.
BACKGROUND ART
Polyetheresteramides have attracted attention recently as new materials for elastomers. Particularly, they have excellent weight reduction, low-temperature properties, chemical resistance, oil resistance, sound-damping qualities and moldability. The demand of them is expected in the production of automobile hoses, tubes, rubber for wipers and soles of sport shoes as well as in other fields wherein a strict hygienic control is required, such as food and medical appliances.
The polyetheresteramides have defects that they are colored due to a decomposition reaction in the course of the polymerization and that their mechanical and physical properties are deteriorated during the use at a high temperature, while polyesteramides have a defect of poor water resistance.
After intensive investigations made for the purpose of producing colorless polyamide elastomers having excellent weight reduction, low-temperature properties, chemical resistance, oil resistance, sound-damping qualities, moldability, heat resistance and water resistance, the inventors have found that the above-mentioned polyamide elastomers can be obtained by reacting (1) at least one polyamide-forming compound selected from the group consisting of amino carboxylic acids, lactams and nylon salts, (2) a dicarboxylic acid and (3) a polycaprolactonediol. The present invention has been completed on the basis of this finding.
DISCLOSURE OF INVENTION
The polyesteramides of the present invention are obtained by reacting:
(1) at least one polyamide-forming compound selected from the group consisting of amino carboxylic acids having 6 to 12 carbon atoms, lactams having 6 to 12 carbon atoms and nylon salts comprising dicarboxylic acids having 4 to 12 carbon atoms and diamines having 4 to 12 carbon atoms,
(2) a dicarboxylic acid having 4 to 54 carbon atoms,
and (3) a polycaprolactonediol having an average molecular weight of 200 to 2,500 or 4,500 to 10,000.
The polycaprolactonediol (3) may be replaced with a polycaprolactonepolyol comprising a mixture of 99.9 to 70 wt. % of a polycaprolactonediol having an average molecular weight of 200 to 10,000 and 0.1 to 30 wt. % of a polycaprolactonepolyol having an average molecular weight of 200 to 10,000 and at least three functional groups.
The polyesteramide obtained from the polycaprolactonediol (3) having an average molecular weight of 4,500 to 10,000 according to the present invention has a melting point of 60.degree. to 150.degree. C. This polyesteramide has advantages as will be described below, though the polycaprolactone component constituting it has such a high molecular weight.
A high molecular weight polycaprolactone (trade name:PLACCEL H; a product of Daicel Ltd.) is a crystalline, thermoplastic polymer having a recurring structure comprising simple units of methylene and ester groups. Since this polymer has a melting point of a low as 60.degree. C. and a high compatibility with various resins, it has been used as a starting material for gypsum, shoe paddings, hot-melt adhesives and additives for various resins (such as agents for improving a gloss, surface smoothness and dyeability and plasticizing agent).
However, the high molecular weight polycaprolactones have problems of an excessively low melting point and insufficient flexibility due to their high crystallizability. Thus it has been demanded to solve these problems.
When the polycaprolactonediol (3) is mixed with an at least trifunctional polycaprolactonepolyol, a polyesteramide having a rubbery elasticity and excellent elastic recovery can be obtained. With this elastomer having the rubbery ela
REFERENCES:
patent: 3169945 (1965-02-01), Hostettler et al.
patent: 4096125 (1978-06-01), Smith et al.
patent: 4345066 (1982-08-01), Ruter
patent: 4380622 (1983-04-01), Chiba et al.
patent: 4415728 (1983-11-01), Tremblay
Okitu Kiyoshi
Watanabe Shiogi
Daicel Chemical Industries Ltd.
Phynes Lucille M.
LandOfFree
Polyesteramide does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyesteramide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyesteramide will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2400092