| 摘要 |
The invention relates to porous post-chlorinated polyvinyl chloride resins which contain or have incorporated therein a salt of phosphoric acid resulting in a substantial improvement in the thermal stability thereof during subsequent processing. The phosphate salt is added to the porous post chlorinated polymer from an aqueous solution thereof which optionally contains a surfactant, which wets the polymer particles and allows the penetration thereof by the solution. Post chlorinated polyvinyl chloride (CPVC) is the most preferred polymer or resin. |
