Plastic additive, plastic composition containing the additive and plastic molding containing the additive

A plastic composition comprising an additive containing a thermoplastic polymer, said plastic composition further comprising a molding plastic which is different from said thermoplastic polymer, wherein said thermoplastic polymer possesses the characteristics of:

• a glass transition temperature of 40.degree. C. to 80.degree. C.;
• a number average molecular weight of 50,000 or less;
• and
• a weight average molecular weight at least five times that of the number average molecular weight, and said plastic composition has magnetic particles dispersed therein.

A molding formed of a plastic composition comprising an additive containing a thermoplastic polymer and said plastic composition further comprising a molding plastic which is different from said thermoplastic polymer, wherein said thermoplastic polymer possesses the characteristics of:

• a glass transition temperature of 40.degree. C. to 80.degree. C.;
• a number average molecular weight of 50,000 or less;
• and
• a weight average molecular weight at least five times that of the number average molecular weight, and said molding has magnetic particles dispersed therein.