Abstract: A solid type golf ball comprising a central core and an outer cover for the core and having an excellent flight performance and durability and acceptable "click" characteristics is presented. The main component of the outer cover of this golf ball is a polyetherester block copolymer containing the following X, Y and Z units:X: Butylene terephthalate unitY: Ester unit other than butylene terephthalateZ: Polyetherester unit derived from a dicarboxylic acid component containing terephthalic acid and poly(alkylene oxide) glycol having a number average molecular weight of 400 through 3000, wherein the X, Y and Z units are present in the following amounts:30% by weight .ltoreq.X.ltoreq.80% by weight0% by weight .ltoreq.Y.ltoreq.50% by weight20% by weight .ltoreq.Z.ltoreq.70% by weight.

Abstract: A polyester amide having excellent mechanical strength, transparency, resistance to oil, adhesive property and heat-sensitivity, comprises (A) an ester unit derived mainly from a benzenedicarboxylic acid and 1,4-butanediol and (B) an amide unit consisting of dodecaneamide and/or undecaneamide, the weight ratio of the ester unit to the amide unit being from 5:95 to 95:5.

Abstract: An improved golf ball having a thread-wound central core and an outer cover is provided. The outer cover is composed of a composition comprising (a) at least one ionomer which is a copolymer of at least one .alpha.-olefin and at least one .alpha.,.beta.-unsaturated carboxylic acid to which copolymer at least one metal ion selected from the group consisting of monovalent, divalent and trivalent metal ions is added and (b) at least one polyester elastomer, the content, in said composition, of said polyester elastomer being 50% by weight or less. This golf ball has excellent cutting resistance, "click" characteristics and impact resilience.

Abstract: A golf ball having an intermediate layer of thermoplastic resin between a thread-wound central core and an outer polyester elastomer layer. The thermoplastic resin has a substantial melt flow initiation temperature of 160.degree. C. or less, the substantial melt flow initiation temperature being the minimum temperature at which the melt index under a load of 4350 g. becomes 1 g/10 mins or more, and has a high adhesion property to the polyester elastomer cover. It is preferable that the thermoplastic resin have a resilience of 30% or more and that the intermediate layer of thermoplastic resin be within the range of 0.1 to 1.0 mm. This golf ball has excellent cutting resistance, "click" characteristics and impact resilience.

Abstract: An improved shaped article can be prepared from a blockcopolyetherester by (a) mixing the same with poly(butylene terephthalate) at a temperature of about 200.degree. to about 230.degree. C. whereby fine fragments of poly(butylene terephthalate) which maintains its own crystalline phase are dispersed in the matrix of the blockcopolyetherester, and (b) molding the mixture at a temperature below the melting point of the poly (butylene terephthalate). The addition of an ester wax and/or a calcium soap improves the extrusion-moldability of the mixture.

Abstract: A golf ball having a thread-wound core and a cover formed of a block copolyetherester comprising (A) a terephthalic acid unit, (B) a 1,4-butanediol unit, (C) a unit of a dicarboxylic acid, other than terephthalic acid, or a short-chain diol, other than 1,4-butanediol, having a number-average molecular weight of not more than 300 and (D) a poly(alkylene oxide)glycol unit having a number-average molecular weight of from 500 to 3000. Said golf ball exhibits excellent impact resilience and also exhibits good cutting resistance and "click".

Abstract: A polyetherester block copolymer having enhanced compatibility of soft polyether segments with hard polyester segments thereof, excellent mechanical strength, a proper melt fluidity and enhanced resistance to chemicals, heat and light, which copolymer comprises (1) 50 to 95% by weight of polyester segments comprising a dicarboxylic acid component containing at least 50 molar percent of terephthalic acid and a diol component containing at least 50 molar percent of 1,4-butane diol and (2) 5 to 50% by weight of polyether segments comprising poly(tetramethylene oxide)glycol, which is characterized by a large number average molecular weight of from 1,500 to 2,500 and by a small variance of less than 1.70 in molecular weight distribution.

Abstract: Disclosed is a blockcopolyetherester composition stabilized by the incorporation of a polysulfide polymer. Products prepared from this composition exhibit an excellent thermal stability as well as UV-light resistance.

Abstract: Hot-melt adhesives for fibers consisting essentially of copolyamides obtained by polymerizing four monomer units, namely, .epsilon.-caprolactam, hexamethylenediammonium adipate, hexamethylenediammonium sebacate, and laurolactam in specific proportions.