# US 5,706,602 A · Method for making a gel coat of gel-coat seed easily disintegrable

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- Number: US 5,706,602 A
- Document ID: US5706602A
- Status: Granted
- Kind: A
- Application number: 08/662,084
- Filed: 1996-06-12
- Granted: 1998-01-13
- Earliest claimed: 1995-06-15
- Assignees: Yazaki Corporation
- Inventors: Yasushi Kohno; Masayoshi Minami; Riichi Minamiguchi
- Web page: https://patentgrep.com/patent/US5706602A

## CPC

- A01C 1/06: Coating or dressing seed
- A01C: PLANTING; SOWING; FERTILISING (parts, details or accessories of agricultural machines or implements, in general A01B51/00 - A01B75/00)

## Abstract

A method for making a gel coat of gel-coated seed easily disintegrable, in which the gel-coated seed has an aqueous gel layer water-insolubilized with a metal ion, wherein the method comprises blocking the insolubilizing action of the metal ion with a sequestering agent.

## Claims

### Claim 1

A method for making the gel coat of gel-coated seed easily disintegrable, in which the gel-coated seed has an aqueous gel layer water-insolubilized with a metal ion, wherein the method comprises "blocking" the insolubilizing action of the metal ion with a sequestering agent, wherein the sequestering agent is pre-contained in the insolubilized aqueous gel layer in an encapsulated form as a microcapsule and is then released from the microcapsule.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the sequestering agent is selected from the group consisting of sodium tripolyphosphate, potassium tripolyphosphate, sodium hexametaphosphate, potassium hexametaphosphate, polycarboxylic acid, and hydroxycarboxylic acid.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the sequestering agent is used in an amount of 20% by weight or less based on the gel-coated seed.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the microcapsule comprises a thermally reversible gel.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein the microcapsule has a diameter of from 0.1 to 0.5 mm.

### Claim 6 (depends on 4)

The method as claimed in claim 4, wherein the thermally reversible gel is selected from the group consisting of gelatin, agar, carrageenan, and higher fatty acid ester.