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Biodegradable disposable diaper
| Details |
Inventors: Takahashi, Takeshi; Terazono, Shigenori; Fujimaki, Takashi; Takiyama, Eiichiro;
Assignee: Showa Highpolymer Co., Ltd. (Tokyo, JP)
Primary Examiner: Green; Randall L.
Assistant Examiner: Zuttarelli; P.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
A biodegradable disposable diaper comprising a combination of a liquid absorbing material, a liquid permeable surface material and an leakproof backing material, said liquid permeable material being formed of an aliphatic polyester resin obtained by reacting an aliphatic saturated polyester prepolymer having an end group which is materially a hydroxyl group with a coupling agent or formed of said aliphatic polyester resin and an aliphatic saturated polyester resin which has not been treated by said coupling agent. The disposable diaper has excellent mechanical strength, softness, feel of touch, productivity as well as biodegradability, air permeability and waterproofness. |
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DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below in further detail.
The aliphatic polyester which is used as the liquid permeable surface material and as the leakproof backing material in the disposable diaper of the present invention mainly consists of a polyester obtained by reacting two components of glycols and dicarboxylic acid (or acid anhydrides thereof), and if necessary as a third component, with at least one polyfunctional component selected from the group consisting of trifunctional or tetrafunctional polyols, oxycarboxylic acids, and polybasic carboxylic acids (or acid anhydrides thereof).
The aliphatic polyesters are prepared by reacting relatively high molecular weight polyester prepolymers which have hydroxyl groups at ends with a coupling agent so as to make them even higher molecular weight polymer.
It has been known to obtain polyurethane by reacting a low molecular weight polyester prepolymer having a number-average molecular weight of 2,000-2,500, which have hydroxyl groups as the terminal groups, with diisocyanate as a coupling agent in the preparation of rubbers, foams, coatings and adhesives.
However, the polyester prepolymers used in these polyurethane foams, coatings and adhesives are prepolymers having a low molecular weight and a number-average molecular weight of 2,000-2,500 which is the maximum that can be prepared by non-catalytic reaction.
To obtain practical physical properties as the polyurethane, it is necessary that the content of diisocyanate should be as much as 10-20 parts by weight in relation to 100 parts by weight of this low molecular weight prepolymer.
When such a large amount of diisocyanate is added to the low molecular weight polyester, gelation occurs so that no normal resins which can be molded in the form of a melt can be obtained.
Therefore, polyesters which are obtained by using a large amount of diisocyanate in the reaction with a low molecular weight polyester prepolymers as a raw material cannot be used as the plastic raw material for the nonwoven fabrics of the present invention
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