Entry sheet for drilling and drilling method
US9826643B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2013 |
| Grant date | Nov 21, 2017 |
| Priority date | — |
| Expiry date | Jul 24, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31703
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Provided is an entry sheet for drilling that, compared with a conventional entry sheet for drilling, has better hole position accuracy, can suppress drill bit breakage, and exhibits less processing chips wrapping around the drill bit. This entry sheet for drilling includes a metallic support foil and a layer comprising a resin composition that is formed on at least one surface of the metallic support foil, wherein the resin composition contains a cellulose derivative (A) and a water-soluble resin (B), the cellulose derivative (A) includes a hydroxyalkyl cellulose and/or a carboxyalkyl cellulose having a weight average molecular weight of 20,000 to 350,000, and based on 100 parts by mass of the resin composition, the content of the cellulose derivative (A) is 5 to 40 parts by mass and the content of the water-soluble resin (B) is 60 to 95 parts by mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.