Claims
- 1. In a vinyl halide polymer composition which is capable of being molded to an impact resistant, substantially transparent or translucent article and which comprises a blend of a vinyl halide polymer wherein the major proportion of the monomer units are vinyl halide monomer residues and a polymeric impact modifier for polyvinyl halide wherein the monomer units consist essentially of methyl methacrylate, 1,3-butadiene and styrene residues and which has about the same refractive index as said vinyl halide polymer, the improvement wherein the blend also comprises a block thermoplastic elastomer wherein the major porportion of the monomer units are residues of a mono-alkenyl-substituted aromatic compound of the benzene or naphthalene series of 8 to 20 carbon atoms and a conjugated alkadiene hydrocarbon of 4 to 10 carbon atoms, said block elastomer being normally incompatible with said vinyl halide polymer, said vinyl halide polymer being present in a major proportion in said blend, and said polymeric impact modifier and said block elastomer together being present in a minor proportion in said blend with the weight ratio of said block elastomer to said methacrylate modifier being about 5:1 to about 1:5.
- 2. The composition of claim 1 wherein the alkenyl aromatic compound is a hydrocarbon of the benzene series and the weight ratio of the block elastomer to the polymeric impact modifier is about 4:1 to about 1:4.
- 3. The composition of claim 2 wherein the units of the block elastomer are styrene and 1,3-butadiene or isoprene and the proportion of the polymeric impact modifier and the block elastomer in the composition is in the range of about 5 to 20 weight percent based on the weight of the blend.
- 4. The composition of claim 3 wherein the vinyl halide polymer is a homopolymer of vinyl chloride and the proportion of the polymeric impact modifier and styrene block elastomer in the composition is about 8 to about 15 weight percent based on the weight of the blend.
- 5. The composition of claim 4 wherein the vinyl chloride polymer is a bulkpolymerized polymer of vinyl chloride.
- 6. The composition of claim 5 wherein the block elastomer is a styrene-1,3-butadiene block elastomer.
- 7. The composition of claim 6 wherein the weight ratio of the styrene to the 1,3-butadiene in the block elastomer is in the range of from about 1:1.5 to about 1:3.
- 8. The composition of claim 7 wherein the block elastomer is a diblock polymer containing styrene and 1,3-butadiene monomer residues in the weight ratio of about 1:3 and the weight ratio of the block polymer to the polymeric impact modifier is about 1:1.
- 9. The composition of claim 7 wherein the block elastomer is a triblock polymer containing styrene and 1,3-butadiene monomer residues in a weight ratio of about 1:3 and the weight ratio of the block polymer to the polymeric impact modifier is about 1:1.
- 10. The composition of claim 7 wherein the block elastomer is a radial block elastomer containing styrene and 1,3-butadiene monomer residues in the weight ratio of about 1:2.3 and the weight ratio of the block elastomer to the polymeric impact modifier is in the range of about 1:1 to about 4:1.
- 11. The composition of claim 7 wherein the block elastomer is a radial block elastomer containing styrene and 1,3-butadiene monomer residues in a ratio of about 2:3 and the weight ratio of block polymer to the polymeric impact modifier is about 1:1 to about 4:1.
- 12. The composition of claim 5 wherein the block elastomer is a styreneisoprene block elastomer.
- 13. The composition of claim 12 wherein the block elastomer is a triblock elastomer containing styrene and isoprene monomer residues in a weight ratio of about 1:6 and the weight ratio of the block elastomer to the polymeric impact modifier is about 1:1.
- 14. An impact resistant, substantially transparent or translucent molded article formed from the composition of claim 1.
- 15. A vinyl halide polymer composition which is capable of being molded to an impact resistant, substantially transparent or transluscent article which comprises a blend of a vinyl halide polymer wherein the major proportion of the monomer units are vinyl halide monomer residues; a polymeric impact modifier for polyvinyl halide wherein the monomer units consist essentially of methyl methacrylate, 1,3-butadiene and styrene residues and which has about the same refractive index as said vinyl halide polymer; and a block thermoplastic elastomer wherein the major proportion of the monomer units are residues of a monovinyl-aromatic hydrocarbon compound of the benzene or naphthalene series of 8 to 20 carbon atoms and a conjugated alkadiene hydrocarbon of 4 to 10 carbon atoms, the proportion of said vinyl-aromatic hydrocarbon residues to said alkadiene residues being in the range of from about 1:1 to about 1:10, said block elastomer being normally incompatible with said vinyl halide polymer, said vinyl halide polymer being present in a major proportion in said blend, and said polymeric impact modifier and said block elastomer together being present in a minor proportion in said blend with the weight ratio of said block elastomer to said polymeric impact modifier being about 5:1 to about 1:5.
Parent Case Info
This is a continuation, of application Ser. No. 881,949, filed Feb. 28, 1978, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3557252 |
Hsieh et al. |
Jan 1971 |
|
3825622 |
Robeson et al. |
Jul 1974 |
|
4161472 |
Lehr |
Jul 1979 |
|
Non-Patent Literature Citations (1)
Entry |
"Encyclopedia of PVC", L.I. Nass (ed); vol. II; Marcel Dekker, Inc. New York & Basel. |
Continuations (1)
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Number |
Date |
Country |
Parent |
881949 |
Feb 1978 |
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