Patent ID: 6114421
Filing Date: 2000-09-05
Classification: C08K,C09K

Abstract:
A process for the preparation of a flame-retarding composition comprising piperazine diacid pyrophosphate, piperazine acid phosphate, melamine acid phosphate, melamine and possibly alkaline phosphates and/or pyrophosphates, comprisingreacting with water a mixture comprising phosphoric anhydride 40% by weight, piperazine 25% by weight and melamine 35% by weight intimately mixed with each other, the water being in an amount of 10% by weight in respect of the total weight of said mixture at a reaction temperature between 50.degree. C. to 100.degree. C. and for a reaction time selected from the group consisting of 2 to 4 hours and 5 to 8 hours.