Thermoplastic resin compositions and temperature-dependent shape-transformable/fixable products making use of the same

A stress memory thermoplastic resin composition comprising a melt-blend of a thermoplastic elastomer (a) and a thermoplastic copolymer (B) having a glass transition temperature within a range of from -20.degree. C. to 70.degree. C., said resin composition having a weight ratio proportion (a)/(B) of from 0.5/1-10/1,

• said composition being elastically transformable to any shape that conforms to a deforming stress applied in a temperature region of from about the glass transition temperature of the thermoplastic polymer (B) to the melting point thereof, and being fixable to the transformed shape in a temperature region lower than the glass transition temperature,
• said stress memory thermoplastic resin being further capable of exhibiting an elastic stress in a temperature region higher than the glass transition temperature to restore its original shape prior to said deforming stress.

A temperature-dependent shape-transformable/fixable product formed by a thermoplastic resin composition comprising a melt-blend of a thermoplastic resin (A) and one or more thermoplastic polymers (B) having a glass transition temperature within a range of from -20.degree. C. to 70.degree. C., said resin composition having a weight ratio proportion of (A)/(B)=95/5-20/80,

• said fixable product being transformable to any shape that conforms to an external stress applied in a temperature region of from about the glass transition temperature of the thermoplastic polymer (B) to the melting point thereof, and being fixed to said shape in a temperature region lower than said glass transition temperature.

A deforming stress memory temperature-dependent shape-transformable/fixable product comprising a melt blend of a thermoplastic elastomer (a) and a thermoplastic polymer (B) having a glass transition temperature within a range of from -20.degree. C. to 70.degree. C., wherein said melt blend is elastically transformed to any shape that conforms to a deforming stress applied in a temperature region from the glass transition temperature of said thermoplastic polymer (B) to the melting point thereof, and is fixed to said shape in a temperature region below the glass transition temperature of said thermoplastic resin (B), said stress memory product being further capable of exhibiting from said fixed shape an elastic stress in a temperature region higher than said glass transition temperature of said melt blend so as to restore its original shape prior to said deforming stress.

A doll hair fiber, comprising a temperature-dependent shape-transformable/fixable product which comprises a melt blend of a thermoplastic resin (A) and one or more thermoplastic polymers (B) having a glass transition temperature within a range of from 0.degree. C. to 70.degree. C., said melt blend having a weight ratio proportion of (A)/(B)=95/5-20/80, the hair fiber having an outer diameter of from 30 .mu.m to 200 .mu.m.