Claims
- 1. In the process of forming a hollow shaped plasticizer-free article of a vinyl chloride polymer by rotational molding wherein a mold containing a vinyl chloride polymer is caused to be rotated through two planes while heated and thereafter cooled; the improvement which comprises utilizing as the molding composition a molding composition comprising a solid plasticizer-free copolymer consisting essentially of 90 to 99.5 weight percent vinyl chloride and 0.5 to 10 weight percent ethylene, said copolymer having a K value of 45 to 65 and being in particulate form and having a grain size of about 0.04 to 0.5 mm, said composition free of plasticizer, and maintaining the inner wall of the mold at about 180.degree. to 200.degree.C.
- 2. The improved process claimed in claim 1 wherein said molding composition has a particle size of about 0.15 to 0.3 mm.
- 3. The improved process claimed in claim 1 wherein said molding composition has a particle size of about 0.2 to 0.3 mm.
- 4. In the process of forming a hollow shaped plasticizer-free article of a vinyl chloride polymer by rotational molding wherein the mold containing a vinyl chloride polymer is caused to be rotated through two planes while heated and thereafter cooled; the improvement which comprises utilizing as the molding composition a composition comprising a solid plasticizer-free copolymer consisting essentially of 90-99.5 weight percent vinyl chloride and 0.5 to 10 weight percent propylene, said polymer having a K value of 45 to 65 and being in particulate form and having a grain size of about 0.04 to 0.5 mm, said composition free of plasticizer and maintaining the inner wall of the mold at about 180.degree. to 200.degree.C.
Priority Claims (2)
Number |
Date |
Country |
Kind |
1946612 |
Nov 1969 |
DT |
|
1957824 |
Nov 1969 |
DT |
|
Parent Case Info
This is a division of application Ser. No. 330,920, filed Feb. 9, 1973, now U.S. Pat. No. 3,887,728 issued on June 3, 1975; which in turn is a continuation of Ser. No. 117,690, filed Nov. 18, 1970, now abandoned, which is in turn a continuation in part of Ser. No. 863,314, filed Oct. 2, 1969 and issued on Sept. 5, 1972 as U.S. Pat. No. 3,689,598 and also a continuation in part of Ser. No. 879,629, filed Nov. 24, 1969, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
2736925 |
Heisler et al. |
Mar 1956 |
|
3468840 |
Heiberger et al. |
Sep 1969 |
|
3468858 |
Heiberger et al. |
Sep 1969 |
|
3468859 |
Davies |
Sep 1969 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
757,550 |
Apr 1967 |
CA |
Divisions (1)
|
Number |
Date |
Country |
Parent |
330920 |
Feb 1973 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
117690 |
Nov 1970 |
|