Composite foams of low thermal conductivity

• US 5,137,927 A
• Filed: 01/24/1992
• Issued: 08/11/1992
• Est. Priority Date: 12/05/1990
• Status: Expired due to Fees

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Hohwiller, Frieder, Seybold, Guenther, Wolff, Bernardo
• Primary Examiner(s): Foelak, Morton
• Application Number:
  US07/825,356
• Time in Patent Office: 200 Days
• Field of Search: 521/54, 521/57, 521/56, 521/60, 521/91
• US Class Current: 521/54
• CPC Class Codes: C08J 2201/038 Use of an inorganic compound to impregnate, bind or coat a foam, e.g. waterglass
• CPC Class Codes: C08J 2325/00 Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
• CPC Class Codes: C08J 9/35 Composite foams, i.e. continuous macromolecular foams containing discontinuous cellular particles or fragments
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 7/26 Silicon- containing compounds
• CPC Class Codes: C08L 25/02 Homopolymers or copolymers of hydrocarbons
• CPC Class Codes: Y10S 521/919 Sintered product

Abstract

A composite foam of low thermal conductivity comprises

a) 20-80% by volume of silica aerogel particles having a mean diameter of from 0.1 to 20 mm and a density of from 0.08 to 0.40 g/cm³,

b) 20-80% by volume of a styrene polymer foam which surrounds the particles of component a) and binds them to one another and has a density of from 0.01 to 0.15 g/cm³, and, if desired,

c) conventional additives in effective amounts.

Claims

1. A composite foam of low thermal conductivity, comprising

a) 20-80% by volume of silica aerogel particles having a mean diameter of from 0.1 to 20 mm and a density of from 0.08 to 0.04 g/cm³,

b) 20-80% by volume of molded polymer foam particles which surrounds the particles of component a) and binds them to one another and has a density of from 0.01 to 0.15 g/cm³.

2. A composite foam as claimed in claim 1, wherein the silica aerogel particles are hydrophobic.