Extruded styrene resin foam and process for producing the same
US6841581B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2003 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Jun 10, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extruded styrene resin foam which is produced by using a blowing agent imposing a reduced load on the environment and has outstandingly excellent thermal insulating property and flame retardant property adapted for construction use. The foam is obtained by extrusion-foaming of a styrene resin and characterized by containing at least, one or more of saturated hydrocarbons having 3 to 5 carbon atoms as a blowing agent, and containing (A) a halogenated flame retardant, and (B) at least one compound selected from the group consisting of phosphorus type flame retardants containing nitrogen atom in a molecule; tetrazole compounds; specific nitrogen-containing compounds; metal borates; boron oxides; phosphoric acid ester compounds, and having a cell structure constituting the foam wherein a cell anisotropic ratio k, which is defined by the formula: k=a/(a×b×c)1/3 wherein, in sections of the foam, a (mm) is an average cell size in the thickness direction, b (mm) is an average cell size in the transverse direction and c (mm) is an average cell size in the longitudinal direction, satisfies the relationship: k≦1.1, and a satisfies the relationship: 0.05≦a≦0.30, and the method for producing…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.