 Process for preparing thermoplastic resin |
| What is claimed is: 1. A process for preparing a thermoplastic resin which comprises emulsion ... |
|
| Thermoplastic resin composition |
| What is claimed is: 1. A thermoplastic resin composition which comprises: (a) 100 parts by weight ... |
|
| Luminescent material |
| What is claimed is: 1. A luminescent beryllium-containing silicate, activated by bivalent europium ... |
|
| Polymeric compositions of styrene and amorphous polyolefins useful in preparing hot melt adhesives |
| I claim: 1. A process for preparing polymeric compositions having a styrene content of about 1 to ... |
|
| Peroxide treated substantially amorphous polyolefins useful as pressure-sensitive adhesives |
| We claim: 1. A process for preparing tacky modified amorphous polyolefin compositions useful as ... |
|
| Hot-melt adhesvies for bonding polyethylene |
| We claim: 1. An adhesive composition capable of being used as a hot-melt adhesive comprising a ... |
|
| Hot-melt adhesive compositions |
| We claim: 1. A hot-melt adhesive composition comprising (1) from about 55 to about 95 weight % of ... |
|
| Biocompatible polymer articles |
| The invention includes polymer articles and a method for making the polymer articles. The polymer ... |
|
| Aqueous acrylic-carboxylated polyether compositions |
| The high molecular weight water-insoluble acrylic polymer is a copolymerized latex product secured ... |
|
| Surface modification of alumina hydrate with liquid fatty acids |
| OF A PREFERRED EMBODIMENT This invention relates to surface modified alumina hydrates employed as ... |
|
|
Thermoplastic copolyester elastomers modified with salts of aliphatic polycarboxylic acid
| Details |
Inventors: Hoeschele, Guenther K.;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Schofer; Joseph L.
Assistant Examiner: Kulkosky; Peter F.
Attorney, Agent or Firm:
A thermoplastic copolyester elastomer composition comprising (A) a copolyester consisting essentially of a multiplicity of long-chain ester units and short-chain ester units joined through ester linkages, said long-chain ester units being represented by the formula ##STR1## and said short-chain ester units being represented by the formula ##STR2## where G is a divalent radical remaining after the removal of hydroxyl groups from at least one long-chain glycol having a melting point of less than about 55.degree. C. and a number average molecular weight of from about 400-4000, R is a divalent radical remaining after removal of carboxyl groups from at least one dicarboxylic acid having a molecular weight of less than about 300, and D is a divalent radical remaining after the removal of hydroxyl groups from at least one aliphatic diol having a molecular weight of less than about 250, with the proviso that at least about 70 mole percent of the short-chain ester units are either ethylene terephthalate units or 1,4-butylene terephthalate units, said short-chain ester units being present in an amount of 15-95% by weight of said copolyester; and (B) from about 0.1 to 10% by weight based on said copolyester of at least one alkali metal salt of an aliphatic polycarboxylic acid containing at least 20 carbon atoms and having a molecular weight of less than about 1500. |
|
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The instant invention comprises novel thermoplastic copolyester elastomer compositions obtained by admixing the elastomer with at least one alkali metal salt of an aliphatic polycarboxylic acid containing at least 20 carbon atoms and having a molecular weight of less than 1500.
The thermoplastic copolyester elastomers consist essentially of repeating long-chain ester units and short-chain ester units, as previously described hereinabove.
The term "long-chain ester units" refers to the reaction product of a long-chain glycol with a dicarboxylic acid.
Such "long-chain ester units," which are a repeating unit in the copolyester, correspond to Formula (I) above.
The long-chain glycols used to prepare the copolyesters have a number average molecular weight of about 400-4000 and a melting point less than about 55.
degree.
C.
Long-chain glycols that can be used for preparing polymers of this invention include the poly(alkylene oxide) glycols where the alkylene is C.
sub.
2 -C.
sub.
8, such as poly(ethylene oxide) glycol, poly(1,2- and 1,3-propylene oxide) glycol, poly(tetramethylene oxide) glycol, poly(pentamethylene oxide) glycol, poly(octamethylene oxide) glycol, and poly(1,2-butylene oxide) glycol; random or block copolymers of ethylene oxide and 1,2-propylene oxide; and polyformals prepared by reacting formaldehyde with glycols, such as pentamethylene glycol, or mixtures of glycols, such as a mixture of tetramethylene and pentamethylene glycols.
Other satisfactory long-chain polymeric glycols include polybutadiene or polyisoprene glycols, copolymers of these, and saturated hydrogenated products of these materials.
Preferred long-chain glycols are poly(tetramethylene oxide) glycol having a number average molecular weight of 600-2000 and ethylene oxide capped poly (propylene oxide) glycol having a number average molecular weight of 1500-2800 and containing 15-35% ethylene oxide.
The short chain ester units are the products of the reaction of a low molecular weight diol and a dicarboxylic acid
|
|
Adhesives and Rubbers 
