# US 5,348,989 A · Ink volatilization preventing composition for aqueous ball point pen

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,348,989 A
- Document ID: US5348989A
- Status: Granted
- Kind: A
- Application number: 08/036,476
- Filed: 1993-03-24
- Granted: 1994-09-20
- Earliest claimed: 1992-03-25
- Assignees: Mitsubishi Pencil Company, Limited
- Inventors: Katsuhiko Shiraishi
- Web page: https://patentgrep.com/patent/US5348989A

## CPC

- C09D 11/18: specially adapted for ball-point writing instruments
- Y02P 20/141: Feedstock
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention provides an ink volatilization preventing composition for an aqueous ball point pen which is to be put onto the upper surface of an aqueous ink having a viscosity of from 10.sup.-3 to 2 Pa sec (25.degree. C.) in an ink tank of the aqueous ball point pen, said composition being obtained by blending a gelling agent and a polyether-modified silicone with a slightly volatile organic liquid. This composition can move together with the ink in the ink tank of the ball point pen without reducing the amount of the composition filled at an initial time, so that the prevention effect of the composition volatilization can be maintained until the ink has been all consumed. In consequence, it is not necessary to fill a large amount of the composition, in contrast to a conventional ink back-blow preventer, and thus there is an advantage that the amount of the ink to be filled can be increased as much as a reducible amount of the composition.

## Claims

### Claim 1

An ink volatilization preventing composition for an aqueous ball point pen which is to be put onto the upper surface of an aqueous ink having a viscosity of from 10.sup.-3 to 2 Pa sec (25.degree. C.) in an ink tank of the aqueous ball point pen, said composition being obtained by blending a gelling agent and a polyether-modified silicone with a slightly volatile organic liquid.

### Claim 2 (depends on 1)

The ink volatilization preventing composition for an aqueous ball point pen according to claim 1 wherein said slightly volatile organic liquid is at least one selected from the group consisting of vaseline, spindle oil, castor oil, olive oil, liquid paraffin and polybutene having an average molecular weight of 300-3000.

### Claim 3 (depends on 1)

The ink volatilization preventing composition for an aqueous ball point pen according to claim 1 wherein said gelling agent is at least one selected from the group consisting of microparticle silica, magnesium stearate, calcium stearate, aluminum stearate, zinc stearate, bentonite, carbon black and phthalocyanines.

### Claim 4

An ink volatilization preventing composition for an aqueous ball point pen which comprises 80 to 90% by weight of a slightly volatile organic liquid, 1 to 15% by weight of a gelling agent, and 0.01 to 5% by weight of a polyether-modified silicone.

### Claim 5

An ink volatilization preventing composition for an aqueous ball point pen which comprises 90 to 97% by weight of polybutene having a molecular weight of from 300 to 3000, 3 to 8% by weight of microparticle silica, and 0.1 to 2% by weight of a polyether-modified silicone.