# US 5,700,534 A · Coloring fluid-containing marking device made of biodegradable plastic resin

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

- Number: US 5,700,534 A
- Document ID: US5700534A
- Status: Granted
- Kind: A
- Application number: 08/511,150
- Filed: 1995-08-04
- Granted: 1997-12-23
- Earliest claimed: 1994-08-11
- Assignees: The Pilot Ink Co., Ltd.
- Inventors: Masaki Shibazaki; Mikiya Ido; Tohru Watanabe
- Web page: https://patentgrep.com/patent/US5700534A

## CPC

- C08G 18/4238: {derived from dicarboxylic acids and dialcohols}
- C08G 2230/00: Compositions for preparing biodegradable polymers
- C08G 2390/00: Containers
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T 428/1397: Single layer [continuous layer]
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A coloring fluid-containing marking device which sufficiently withstand practical use and, after use, its molded members can be biologically degraded in soil. The marking device comprises a coloring fluid container molded from an aliphatic polyester resin, and a coloring fluid containing a solvent mainly comprising an aliphatic hydrocarbon and/or an alicyclic hydrocarbon.

## Claims

### Claim 1

A marking device comprising a container containing a coloring fluid therein, said container being a molded article of a biodegradable aliphatic polyester, and said coloring fluid comprising a colorant, a liquid solvent mainly comprising a member selected from the group consisting of an aliphatic hydrocarbon having the formula C.sub.n H.sub.2n+2, wherein n is a positive integer, an alicyclic hydrocarbon and a mixture thereof, and a resin soluble in said solvent.

### Claim 2 (depends on 1)

The marking device according to claim 1, wherein said container is a barrel of said marking device.

### Claim 3 (depends on 1)

The marking device according to claim 1, wherein said marking device further comprises an molded article comprising an aliphatic polyester.

### Claim 4 (depends on 1, 2)

The marking device according to claim 1, 2, or 3, wherein said aliphatic polyester is represented by formula (I) or (II): ##STR4## wherein m represents a degree of polymerization making the number average molecular weight 10,000 to 100,000; M represents an integer of 0 or more; R.sup.1 and R.sup.2, which may be the same or different, each represent an alkylene group, a cycloalkylene group, or a cycloalkylene-containing alkylene group, in which the alkylene group or alkylene moiety may be straight or branched; and R.sup.3 represents a di- or polyisocyanate residue, ##STR5## wherein m' represents a degree of polymerization making the number average molecular weight 25,000 to 70,000; and R.sup.1 and R.sup.2, which may be the same or different, each represent an alkylene group, a cycloalkylene group, or a cycloalkylene-containing alkylene group, in which the alkylene group or alkylene moiety may be straight or branched.

### Claim 5 (depends on 4)

The marking device according to claim 4, wherein R.sup.1 and R.sup.2, which may be the same or different, each represent an alkylene group having 2 to 10 carbon atoms, a cycloalkylene group having 3 to 10 carbon atoms, or a cycloalkylene-containing alkylene group having 4 to 10 carbon atoms, in which the alkylene group or alkylene moiety may be straight or branched.

### Claim 6 (depends on 1)

The marking device according to claim 1, wherein 90% by weight or more of the solvent of the coloring fluid is a member selected from the group consisting of an aliphatic hydrocarbon, an alicyclic hydrocarbon and a mixture thereof.

### Claim 7 (depends on 6)

The marking device according to claim 6, wherein said solvent comprises a member selected from the group consisting of methylcyclohexane, ethylcyclohexane, hexane, heptane, and a mixture of two or more thereof.