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| Solar energy collector |
| OF THE INVENTION In FIG. 1, a solar panel 20 consisting of a central chamber 21, and a conduit or ... |
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| Catalytic heater or warmer |
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| Solar collector panel |
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| Method for lubricating and conditioning monofilament fishing lines |
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| Styrene-butadiene-acrylonitrile interpolymer latex based cement additives |
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Polyester urethane fiber: polyester made from methyl pentane diol
| Details |
Inventors: Hirai, Koji; Yamashita, Setuo; Komiya, Yukiatsu; Maeda, Katsura;
Assignee: Kuraray Co., Ltd. (Kurashiki, JP)
Primary Examiner: Welsh; Maurice J.
Assistant Examiner: Johnson; Rachel
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
Provided is an elastic polyurethane fiber having excellent hot water resistance, elastic recovery at low temperatures and elongation, prepared from a polyurethane obtained by copolymerization of a high polymer diol obtained from 3-methyl-1,5-pentanediol and an aliphatic dicarboxylic acid, an organic diisocyanate and a chain extender. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The elastic polyurethane fiber of the present invention is characterized by the high polymer diol residue, that is, the soft segment, contained in its material polyurethane.
In the present invention, the high polymer diol (A) used is a polyester diol having a number average molecular weight of 1,000 to 3,500, comprising repeating units represented by the general formula ##STR3## wherein R.
sup.
1 represents a divalent organic group(s) at least 50% by mole of which is ##STR4## and n represents an integer of 4 to 10, and satisfying the following relationships (1) and (2).
##STR5## wherein the total number of carbon atoms is the number of carbon atoms in the high polymer diol excluding those contained in the ester bonds.
The polyester diol is obtained by using as the diol component a diol(s) including 3-methyl-1,5-pentanediol in an amount of at least 50% by mole of the total diols and as the dicarboxylic acid component an aliphatic dicarboxylic acid having 4 to 10, preferably 7 to 10 methylene groups such as adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid and 1,10-decanedicarboxylic acid.
The diol is combined with the dicarboxylic acid in such a ratio as will satisfy: ##STR6## If the ratio is smaller than 6, the resultant fiber will be significantly low in resistances to hot water and low temperatures.
On the other hand, if the ratio exceeds 9, the resultant fiber will have a poor elastic recovery and be poor in resistance to low temperatures and have low elongation.
The ratio is more preferably: ##STR7## It is further important in the present invention that the ratio of the number of methyne groups of the polyester diol used to the total number of carbon atoms be not less than 0.
03 and not more than 0.
1.
With the ratio of less than 0.
03 the elastic recovery, particularly that at low temperature, of the resulting fiber is low, while with the ratio of more than 0.
1 the heat resistance, tensile strength and elasic recovery are low
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