Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-04-13
1995-12-05
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253302, 5253306, 525363, C08F 842
Patent
active
054730236
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a highly water-absorptive fiber. More specifically, it relates to a highly water-absorptive fiber suitable for use in the field of industrial materials required to have high water absorption properties such as sealing materials.
TECHNICAL BACKGROUND
Japanese Laid-open Patent Publication No. 183515/1989 discloses a highly water-absorptive fiber obtained by imparting an acryl fiber with high water absorption properties by the hydrolysis of the acryl fiber.
However, the defect is that when an acryl fiber is hydrolyzed, the fiber colors or that the percentage of physiological saline solution absoprtion decreases to about a half of the percentage of pure water absorption.
Japanese Laid-open Patent Publication No. 159405/1988 discloses a fiber formed of a copolymer which is produced from a vinyl monomer having a carboxylic acid group and a vinyl monomer having a hydroxyl group reactive with a carboxylic acid group and in which some of the carboxylic acid groups is converted to sodium salt. In this fiber, the percentage of physiological saline solution absorption does not decrease much as it is about 2/3 of the percentage of pure water absorption. However, the crosslinking reaction between the hydroxyl group and the carboxyl group proceeds slowly, and it is required to carry out the crosslinking reaction at a temparture of 180.degree. C. or higher, which increases the cost.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a novel highly water-absorptive fiber.
It is another object of the present invention to provide a highly water-absorptive fiber, which has high water absorption properties, is almost free from coloring, has excellent properties of absorbing a physiological saline solution, has excellent carding and spinning properties and inexpensive.
Other objects and advantages of the present invention will be apparent from the following description.
According to the present invention, the above objects and advantages of the present invention will be achieved, first, by a highly water-absorptive fiber (to be referred to as "first highly water-absorptive fiber" of the present invention hereinafter) formed of a copolymer containing: carboxyl groups of the polymer units being converted to Na salt and/or K salt, and consisting of a vinyl monomer having an amino group and a vinyl monomer having a hydroxyl group and an amino group.
According to the present invention, the above objects and advantages of the present invention will be achieved, second, by a highly water-absorptive fiber (to be referred to as "second highly water-absorptive fiber" of the present invention hereinafter) formed of a copolymer containing: carboxyl groups of the polymer units being converted to Na salt and/or K salt, and units from a vinyl monomer having a hydroxyl group.
According to the present invention, the above objects and advantages of the present invention will be achieved, third, by a highly water-absorptive fiber (to be referred to as "third highly water-absorptive fiber" of the present invention hereinafter) formed of a copolymer containing: carboxyl groups of the polymer units being converted to Na salt and/or K salt, and from a vinyl monomer having a hydroxyl group and polymer units from a vinyl monomer having a hydroxyl group and an amino group.
According to the present invention, the above objects and advantages of the present invention will be achieved, fourth, by a highly water-absorptive fiber (To be referred to as "fourth highly water-absorptive fiber" of the present invention hereinafter) formed of a copolymer containing: carboxyl groups of the polymer units being converted to Na salt and/or K salt, and units from a vinyl monomer having an amino group and a hydroxyl group.
According to the present invention, the above objects and advantages of the present invention will be achieved, fifth, by a highly water-absorptive fiber (to be referred to as "fifth highly water-absorptive fiber" of the present invention hereinafter) formed of a copo
REFERENCES:
patent: 4090013 (1978-05-01), Ganslaw et al.
patent: 4185831 (1980-01-01), Tominaga
patent: 4517330 (1985-05-01), Zdanowski et al.
patent: 4604420 (1986-08-01), Sato
patent: 4990574 (1991-02-01), Yamada
Agari Katsumi
Fukumoto Hiroko
Kakegawa Miyako
Mizukami Yoshikatsu
Tanaka Yutaka
Kanebo Ltd.
Lipman Bernard
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