CA2405376A1 - Anti-lumping compounds for use with expandable polystyrene beads - Google Patents

Anti-lumping compounds for use with expandable polystyrene beads Download PDF

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Publication number
CA2405376A1
CA2405376A1 CA 2405376 CA2405376A CA2405376A1 CA 2405376 A1 CA2405376 A1 CA 2405376A1 CA 2405376 CA2405376 CA 2405376 CA 2405376 A CA2405376 A CA 2405376A CA 2405376 A1 CA2405376 A1 CA 2405376A1
Authority
CA
Canada
Prior art keywords
lumping
polystyrene beads
expandable polystyrene
compounds
agents
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2405376
Other languages
French (fr)
Other versions
CA2405376C (en
Inventor
Ronald Gabbard
Bernhard Schmied
Eric R. Weisenbach
Robert Dean Ober
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Corp
Original Assignee
BASF Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US10/246,209 external-priority patent/US6646018B2/en
Application filed by BASF Corp filed Critical BASF Corp
Publication of CA2405376A1 publication Critical patent/CA2405376A1/en
Application granted granted Critical
Publication of CA2405376C publication Critical patent/CA2405376C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

An anti-lumping agent for use with expandable polystyrene beads is disclosed.
The expandable polystyrene beads comprise a styrene or styrene derivative polymer in combination with a blowing agent, Typical blowing agents are C3-C6 hydrocarbons, with pentane being especially preferred. The anti-lumping agents include block copolymers formed from blocks of ethylene oxide and propylene oxide. Preferably, the copolymers have a number average molecular weight of from about 4,000 to 15,000, and a hydrophilic-lipophilic balance number of from about 16 to 29. The anti-lumping agents significantly reduce the lumping potential of the expandable polystyrene beads, especially when they are expanded to low densities of from about 1.5 to 0.75 lbs. per cubic foot, and more preferably to densities of from about 1.2 to 0.85.
CA 2405376 2001-09-28 2002-09-26 Anti-lumping compounds for use with expandable polystyrene beads Expired - Fee Related CA2405376C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US96710301A 2001-09-28 2001-09-28
US09/967,103 2001-09-28
US10/246,209 2002-09-18
US10/246,209 US6646018B2 (en) 2001-09-28 2002-09-18 Anti-lumping compounds for use with expandable polystyrene beads

Publications (2)

Publication Number Publication Date
CA2405376A1 true CA2405376A1 (en) 2003-03-28
CA2405376C CA2405376C (en) 2006-09-19

Family

ID=26937795

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2405376 Expired - Fee Related CA2405376C (en) 2001-09-28 2002-09-26 Anti-lumping compounds for use with expandable polystyrene beads

Country Status (2)

Country Link
CA (1) CA2405376C (en)
MX (1) MXPA02009408A (en)

Also Published As

Publication number Publication date
MXPA02009408A (en) 2004-07-30
CA2405376C (en) 2006-09-19

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