Powder comprising hydrolyzable resin particles

• US 10,385,171 B2
• Filed: 08/11/2015
• Issued: 08/20/2019
• Est. Priority Date: 09/09/2014
• Status: Active Grant

• Current Assignee: Toyo Seikan Group Holdings, Ltd.
• Original Assignee: Toyo Seikan Group Holdings, Ltd.
• Inventors: Yoshikawa, Seishi, Yamada, Toshiki, Katayama, Tsutaki
• Primary Examiner(s): Rodd, Christopher M
• Application Number:
  US15/508,997
• Publication Number:
  US 20170253703A1
• Time in Patent Office: 1,470 Days
• Field of Search: None
• CPC Class Codes: C08J 2300/20 Polymers characterized by their physical structure
• CPC Class Codes: C08J 2367/04 Polyesters derived from hydroxy carboxylic acids, e.g. lactones C08J2367/06 takes precedence
• CPC Class Codes: C08J 2401/10 Esters of organic acids
• CPC Class Codes: C08J 3/12 Powdering or granulating
• CPC Class Codes: C08K 5/11 of acyclic polycarboxylic acids
• CPC Class Codes: C08L 101/16 the macromolecular compounds being biodegradable
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: C09K 8/035 Organic additives
• CPC Class Codes: C09K 8/5086 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09K 8/516 characterised by their form or by the form of their components, e.g. encapsulated material
• CPC Class Codes: C09K 8/68 containing organic compounds
• CPC Class Codes: C09K 8/70 characterised by their form or by the form of their components, e.g. foams
• CPC Class Codes: C09K 8/885 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09K 8/92 characterised by their form or by the form of their components, e.g. encapsulated material C09K8/70 takes precedence
• CPC Class Codes: E21B 43/16 Enhanced recovery methods for obtaining hydrocarbons

Abstract

A powder comprising hydrolyzable resin particle, containing particles which do not pass through a sieve having an opening size of 500 μm in an amount of 50 mass % or more and having a repose angle of 51° or more. This powder is preferably used as an additive for drilling to enhance the drilling properties of a drilling fluid and improve the retentivity of a fracture extending from a winze.

Claims

1. A powder comprising hydrolyzable resin particles, containing particles which do not pass through a sieve having an opening size of 500 μ

m in an amount of 50 mass % or more and having a repose angle of 51°

or more, wherein the hydrolyzable resin is polylactic acid.

2. The powder according to claim 1, wherein the resin particles have a 16-mesh pass particle diameter.

3. The powder according to claim 1 which has a bulk density of 0.30 to 0.54 g/ml.

4. The powder according to claim 1, wherein the polylactic acid has a crystallinity of 30% or less.

5. The powder according to claim 1 which is used as an additive for drilling fluids.

6. The powder according to claim 1 which is used as an additive for excavation.