摘要:
A spontaneously degradable fiber excellent in bulkiness, softness, stretchability and feeling, which comprises a lowly heat-shrinkable fiber component (A) made of a highly crystalline aliphatic polyester and a highly heat-shrinkable fiber component (B) made of an aliphatic polyester (such as lowly crystalline or non-crystalline aliphatic polyester, a block copolymer or mixture comprising aliphatic polyester as the main component and being composed of a high-melting component and a low-melting component, or the like). Further, fibers excellent in self-crimpability or self-bondability or separable fibers can be obtained by combining the fiber components (A) and (B) suitably to form a composite fiber or yarn.
摘要:
A biodegradable copolyester produced by copolymerizing a lactic acid compound as the main ingredient with PEG, an aliphatic polyester or an ester-forming sulfonic acid derivative and having an average molecular weight of 50,000 or above, a molding produced therefrom, such as composite fibers, and a process for producing the molding.
摘要:
A flame-retardant polyester comprising a thermoplastic polyester and, introduced thereinto, at least one flame-retardant component comprising phosphorus-containing dicarboxylic acid or diol units selected from among three components represented by general formula (I) in a phosphorus atom content of 0.2-3.0 wt.% based on the total weight, and moldings thereof, such as fiber, film and resin moldings, wherein R represents alkyl, aryl or aralkyl; and X represents a group selected from among -R1COO-, OR2O-(-OC-A-COOR2O-)-a and -(-OR2-)-bO-A-O-(-R2O-)-c, wherein R1 represents alkylene bonded to the phosphorus atom, R2 represents C2-C4 alkylene, A represents a divalent aromatic residue, a = 1-10, b = 0-5, and c = 0-5. The flame-retardant component has excellent heat resistance, does not sublime in the step of introducing the same into a high-temperature polyester reaction system or during the molding of the polyester, is excellent in durability under repeated washing, light-fasteness and whiteness, and does not deteriorate the properties inherent in thermoplastic polyester.