Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Process for preparing closed-cell water-blown rigid polyurethane foams having improved mechanical properties

a technology of rigid polyurethane and closed-cell water, which is applied in the field of preparing closed-cell water-blown rigid polyurethane foam, can solve the problems of poor insulating properties of foams produced by the process described in u.s. pat, 443 and friable foams produced by the process using relatively high water as a blowing agen

Inactive Publication Date: 2005-01-27
BAYER MATERIALSCIENCE AG
View PDF28 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The present invention relates to a process for preparing closed-cell water-blown rigid polyurethane foams which have reduced friability and acceptable adhesion to substrates and which also have acceptable compressive strength. The present invention also relates to closed-cell water-blown rigid polyurethane foams produced by the process of the present invention. The invention further relates to a polyurethane-foam forming mixture which is used to produce closed-cell water-blown rigid polyurethane foams which have reduced friability and acceptable adhesion to substrates and which also have acceptable compressive strength.

Problems solved by technology

There are, however, drawbacks to using water as a blowing agent for producing rigid polyurethane foams.
One such drawback is the fact that foams produced using relatively high levels of water as a blowing agent are friable and have relatively poor adhesion to substrates.
Due to their open-cell structure, one skilled in the art would expect that the foams produced by the process described in U.S. Pat. No. 6,127,443 would have poor insulating properties.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

examples

[0040] The following compounds were used in the examples: [0041] Polyol A: a polyether polyol having an OH number of about 56 prepared by KOH-catalyzed alkoxylation of a mixture of gycerine:propylene glycol (88:12 pbw) with a block of propylene oxide (30 wt. % of the total oxide), followed by a mixed block of propylene oxide (40 wt. % of the total oxide) and ethylene oxide (10 wt. % of the total oxide) and finished with a block of propylene oxide (20 wt. % of the total oxide); [0042] Polyol B: a polyether polyol having an OH number of about 470 prepared by KOH-catalyzed alkoxylation of glycerine with propylene oxide; [0043] Polyol C: a polyether polyol having an OH number of about 56 prepared by zinc hexacyanocobaltate-catalyzed alkoxylation of a mixture of glycerine:propylene glycol (86:14 pbw) with a mixed block of propylene oxide (93 wt. %) and ethylene oxide (7 wt. %); [0044] Polyol D: a modified diethylene glycol phthalate polyester polyol having an OH value of from about 230 t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
hydroxyl valueaaaaaaaaaa
Login to View More

Abstract

The present invention is directed to a process for preparing water-blown rigid polyurethane foams having at least an 80% closed-cell content which involves reacting a) at least one polyol mixture which is composed of (i) at least one polymer polyol; (ii) at least one polyol having a hydroxyl value within the range of from about 200 to about 800; and (iii) optionally, at least one polyol having a hydroxyl value within the range of from about 25 to about 115; with b) at least one polymeric isocyanate and / or a prepolymer thereof; in the presence of c) optionally, at least one catalyst; d) water; and e) optionally, at least one additive or auxiliary agent. The present invention is also directed to the closed-cell water blown rigid polyurethane foams produced by the process of the present invention. The invention is further directed to a polyurethane-foam forming mixture which is used to produce the water-blown rigid polyurethane foams of the present invention. Foams produced according to the present invention have reduced friability and acceptable adhesion to substrates as well as acceptable compressive strength.

Description

TECHNICAL FIELD OF THE INVENTION [0001] The present invention relates to a process for preparing closed-cell water-blown rigid polyurethane foams which have reduced friability and acceptable adhesion to substrates and which also have acceptable compressive strength. The present invention is also directed to closed-cell water-blown rigid polyurethane foams produced by the process of the present invention. The invention is further directed to a polyurethane-foam forming mixture which is used to produce closed-cell water-blown rigid polyurethane foams which have reduced friability and acceptable adhesion to substrates and which also have acceptable compressive strength. BACKGROUND OF THE INVENTION [0002] Rigid polyurethane foams are widely known and are used in numerous industries. Rigid polyurethane foams are produced by reacting a polyisocyanate with a polyol in the presence of a blowing agent. Chlorofluorocarbons (CFC's) were typically used as blowing agents to produce rigid polyure...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C08G18/10C08G18/40
CPCC08G18/10C08G18/4072C08G18/409C08G2101/0025C08G2101/0083C08G2101/0058C08G18/40C08G2110/0025C08G2110/0058C08G2110/0083Y10T428/31573Y10T428/31583Y10T428/31587Y10T428/31605
Inventor HAIDER, KARL W.NODELMAN, NEIL H.FORSYTHE, JOHN P.SUDDABY, BRIAN R.
Owner BAYER MATERIALSCIENCE AG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com