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Production of Low Density Poly Propylene Foam
| Content Provider | Semantic Scholar |
|---|---|
| Author | William Magidson, Herb Medhurst, Ralph C. |
| Copyright Year | 2017 |
| Abstract | (56) References Cited U.S. PATENT DOCUMENTS 3,607,796 9/1971 Eberle et al. ........................ 521/134 3,846,349 11/1974 Harada et al. ...................... 521/134 Primary Examiner-Morton Foelak Attorney, Agent, or Firm-William E. Murray; William H. Magidson; Ralph C. Medhurst (57) ABSTRACT A method of producing a foamed product having a density less than 0.2 g/cm3, which comprises foaming a composition comprising a major proportion of a low viscosity polypropylene component having a melt vis cosity (at 190° C. and a shear rate of 1000 sec) of less than 2x 103 poise and a minor proportion of a high viscosity polypropylene component having a melt vis cosity (at 190° C. and a shear rate of 1000 sec) of greater than 2.5x103 poise. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://patentimages.storage.googleapis.com/54/d2/71/065082a4d8b477/US4940736.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |