Foamable polyvinyl chloride compound tolerant of high heat conditions
A foamable PVC compound is disclosed. The compound comprises polyvinyl chloride, heat deflection temperature modifier, and optionally, a blowing agent. Conventional additives are optionally present. Profile extruded, foamed articles can be made with the compound.
1 . A foamable polyvinyl chloride compound, comprising:
polyvinyl chloride,
heat deflection temperature modifier, and
optionally, a blowing agent,
wherein the amount of heat deflection temperature modifier is at least 25 parts per 100 parts of polyvinyl chloride.
2 . The compound of claim 1 , further comprising lubricant, thermal and ultra-violet light stabilizers, antioxidant, impact modifier, processing aid, filler, pigment, reinforcing material, plasticizer, or combinations thereof.
3 . The compound of claim 1 , wherein the amount of heat deflection temperature modifier ranges from about 25 to about 100 parts per 100 parts of polyvinyl chloride.
4 . The compound of claim 1 , wherein the amount of heat deflection temperature modifier ranges from about 40 to about 85 parts per 100 parts of polyvinyl chloride.
5 . The compound of claim 1 , wherein the amount of optional blowing agent ranges from about 0.01 to about 1 part per 100 parts of polyvinyl chloride.
6 . The compound of claim 1 , wherein the amount of optional blowing agent ranges from about 0.1 to about 0.8 part per 100 parts of polyvinyl chloride.
7 . The compound of claim 1 , extruded and foamed in a profile form.
8 . The compound of claim 1 , mixed and unfoamed in a pellet form.
9 . A method of using the compound of claim 8 , comprising the steps of: (a) placing pellets of the compound in an extruder to make a foamed compound and (b) extruding the foamed compound through a profile die to make a foamed, extruded profile.
10 . The method of claim 9 , wherein blowing agent is included in the compound pellets.
11 . The method of claim 9 , wherein blowing agent is added separately from the compound pellets during step (a).