公开(公告)号：US3880803A

公开(公告)日：1975-04-29

申请号：US31363672

申请日：1972-12-11

Applicant: STAMICARBON

Inventor： KEIZER SIETSKE

IPC: C08J3/20 ,  C08F45/58 ,  C08G51/58

CPC classification number: C08J3/203

Abstract: A process for stabilizing conventional particulate thermoplastic organic polymers by admixing conventional stabilizers for the polymers is disclosed, wherein the resulting polymer-stabilizing mixture is homogeneous and exhibits good polymer stability. The stabilizer has a melting point at least 1* C less than the temperature at which the polymer agglomerates and/or sinters and/or decomposes. The stabilizer is in the non-liquid state and preferably has a viscosity of at least 50 poise, measured under the conditions at which the stabilizer is added to the polymer. The polymer is heated to a temperature above the melting point of the stabilizer, and lower than the agglomeration and/or decomposition and/or sintering temperature of the polymer. The stabilizer is admixed with the polymer while the polymer is maintained at about the aforesaid temperature, and while the stabilizer is at a temperature at least about 1* C lower than the stabilizer melting point temperature. The mixing is preferably at a shear rate no greater than 1000 sec 1. The resulting polymers may be used in conventional applications for such polymers, and will exhibit improved stability against heat, light and/or oxygen.

Abstract translation: 公开了通过混合聚合物的常规稳定剂来稳定常规颗粒状热塑性有机聚合物的方法，其中所得聚合物稳定混合物是均匀的并且表现出良好的聚合物稳定性。 稳定剂的熔点比聚合物凝聚和/或烧结和/或分解的温度低至少1℃。 稳定剂处于非液体状态，优选在稳定剂加入聚合物的条件下测定的至少50泊的粘度。 将聚合物加热至高于稳定剂熔点的温度，并低于聚合物的聚集和/或分解和/或烧结温度。 稳定剂与聚合物混合，同时聚合物保持在约上述温度，而稳定剂的温度比稳定剂熔点温度低至少约1℃。 混合优选为不大于1000sec -1的剪切速率。