High density information records of an electrostatic capacitance type
US4631717A · kind A · utility
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5References
8Claims
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Key dates
| Filing date | Nov 26, 1984 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Nov 26, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
High density information records formed from conductive resin compositions which comprise a graft polymer obtained by subjecting vinyl chloride monomer to graft polymerization with a copolymer of ethylene and vinyl acetate having a content of vinyl acetate of not less than 35 wt % and a melt index up to 20 and prepared according to a solution polymerization technique. The conductive composition further comprises predetermined amounts of a conductive material and a lubricant of a specific type. The lubricant is an ester between aliphatic acid and alcohol having a hydroxyl value not larger than 15.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.