Process for crystal nucleation of crystalline thermoplastic resin

A process for increasing the crystallization rate of crystalline thermoplastic resin, the process consisting of:

• admixing a melt blending time decreasing effective amount of compatibilizing agent, a crystallization rate increasing effective amount of a nucleating agent and crystalline thermoplastic resin;
• and
• melt blending said admixture of a melt blending time decreasing effective amount of compatibilizing agent, a crystallization rate increasing effective amount of a nucleating agent and crystalline thermoplastic resin;
• wherein said compatibilizing agent is at least one member selected from the group consisting of C.sub.12 -C.sub.22 higher fatty acid metallic salts, rosin glycerol ethers, antistatic agents, polyolefin waxes and hydrogenated petroleum resins;
• wherein said nucleating agent consists of (i) at least one metallic salt of rosin acid selected from the group consisting of those represented by the formula (Ia), formula (Ib), dihydropimaric acid and mixtures thereof:
• ##STR14## wherein each of R.sup.1, R.sup.2 and R.sup.3, which may be the same or different, is independently a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, and the three broken lines in formula (Ib) represent possible positions for a chemical bond to form an unsaturated double bond, only one such unsaturated double bond being present in formula (Ib) and (ii) at least one free acid selected from the group consisting of those represented by formula (Ia), formula (Ib), dihydropimaric acid and mixtures thereof, wherein said at least one metallic salt is 5 to 100 equivalent % of said nucleating agent, based on the total amount of the carboxyl groups of rosin acid;
• and wherein said at least one metallic salt is selected from the group consisting of potassium salt, sodium salt, magnesium salt and mixtures thereof and wherein said crystalline thermoplastic resin is selected from the group consisting of polyolefins, polyamides, polyesters, polyacetals, mixtures thereof and mixtures of one or more thereof with one or more additives selected from the group consisting of crosslinking agents, heat stabilizers, weathering stabilizers, lubricants, release agents, inorganic fillers, pigments, dyes and pigment dispersants.