EP1572790A2 - A closed cell phenolic foam - Google Patents

A closed cell phenolic foam

Info

Publication number
EP1572790A2
EP1572790A2 EP03780560A EP03780560A EP1572790A2 EP 1572790 A2 EP1572790 A2 EP 1572790A2 EP 03780560 A EP03780560 A EP 03780560A EP 03780560 A EP03780560 A EP 03780560A EP 1572790 A2 EP1572790 A2 EP 1572790A2
Authority
EP
European Patent Office
Prior art keywords
weight
surfactant
content
approximately
oxide content
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.)
Withdrawn
Application number
EP03780560A
Other languages
German (de)
French (fr)
Inventor
Graham Morgan Edgerley
Thomas Mccabe
Malcolm Rochefort
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.)
Kingspan Holdings IRL Ltd
Original Assignee
Kingspan Holdings IRL Ltd
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
Application filed by Kingspan Holdings IRL Ltd filed Critical Kingspan Holdings IRL Ltd
Publication of EP1572790A2 publication Critical patent/EP1572790A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/143—Halogen containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/143—Halogen containing compounds
    • C08J9/144—Halogen containing compounds containing carbon, halogen and hydrogen only
    • C08J9/146—Halogen containing compounds containing carbon, halogen and hydrogen only only fluorine as halogen atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/04—Foams characterised by their properties characterised by the foam pores
    • C08J2205/052—Closed cells, i.e. more than 50% of the pores are closed
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
    • C08J2361/04—Condensation polymers of aldehydes or ketones with phenols only
    • C08J2361/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes

Definitions

  • the invention relates to a closed cell phenolic foam and to foam mixtures used in producing such foams.
  • Phenolic foams are widely used in building applications in view of their thermal insulation and fire resistant properties. Such phenolic foams are generally prepared by mixing a phenol formaldehyde resin with a blowing agent, a cell stabliliser and a hardener.
  • EP - A - 0170357 describes one such process for preparing a phenolic foam using Freon as a blowing agent, aqueous sulphuric acid as a hardener, and a cell stabiliser derived by oxylating castor oil with ethylene oxide or mixtures thereof with propylene oxide.
  • Freon is a particular chlorofluorocarbon (CFC).
  • EP-A-0439283 describes the use of a complex blend of materials as an alternative blowing agent to a CFC.
  • the blend comprises: at least one perfluoroalkane (PFA) (especially perfluoropentane, perfluorohexane or perfluoroheptane); and at least one component selected from a hydrogenated chlorofluorocarbon (HFC) and a specific alkane or cycloalkane.
  • PFA perfluoroalkane
  • HFC hydrogenated chlorofluorocarbon
  • US 4,530,939 describes a process for preparing a foam material wherein a phenol- aldehyde resole resin, a blowing agent and a surfactant are mixed with an acid catalyst to form an admixture which is poured into a forming means and cured.
  • the resole resin is stripped using a solvent to reduce viscosity and water content.
  • An unbranched dihydroxy either polyglycol is added to the stripped resole resin.
  • the surfactant used in the process is an alkyl siloxane alkylene oxide block copolymer.
  • the blowing agent is trichloromethane.
  • US 3,271,331 describes a mixture for use in producing a foamed phenol-aldehyde resole resin.
  • the mixture comprises a phenol-aldehyde resole resin and a siloxane- oxyalkylene copolymer as a foam stabiliser for the foamed phenol-aldehyde resole resin.
  • Crosslinking compounds and modifiers are also added to the mixture.
  • EP 0899291 describes a thermoplastic resin composition comprising a thermoplastic resin and a clay composite.
  • the clay composite is prepared by introducing a silane compound into a swellable silicate.
  • a phenolic foam mixture for producing a substantially closed cell phenolic foam comprising a phenolic resin, a polysiloxane copolymer used as a surfactant, a blowing agent, and a catalyst (polymerization initiator), the polysiloxane copolymer having:-
  • a polypropylene oxide content of from 15% to 20% by weight.
  • the improved phenolic foam of the invention is easily processed and has good long term aged thermal conductivity properties.
  • a polysiloxane cell stabiliser as defined is used at a low addition level.
  • the polysiloxane content of the surfactant is from 28% to 32% by weight.
  • the polyethylene oxide content of the surfactant is preferably from 51% to 55% by weight.
  • the polypropylene oxide content of the surfactant is preferably from 16% to 18% by weight.
  • the surfactant has a polysiloxane content of approximately 28% by weight, a polyethylene oxide content of approximately 55% by weight and a polypropylene oxide content of approximately 18% by weight.
  • the surfactant has a polysiloxane content of approximately 30% by weight, a polyethylene oxide content of approximately 53% by weight, and a polypropylene oxide content of approximately 17% by weight.
  • the surfactant has a polysiloxane content of approximately 32% by weight, a polyethylene oxide content of approximately 51% by weight, and a polypropylene oxide content of approximately 16% by weight.
  • the surfactant may be present in an amount of at least 0.5 parts by weight of the mixture.
  • the invention also provides the use of a surfactant having:-
  • a polypropylene oxide content of from 15% to 20% by weight in the manufacture of a substantially closed cell phenolic insulating foam.
  • the surfactant is preferably as defined above.
  • the invention provides a phenolic insulating foam with a closed cell content of at least 90% prepared from the foam mixture of the invention.
  • the invention is based on the surprising finding that closed cell phenolic foams can be produced by using relatively small quantities of specific polysiloxane copolymers as surfactants.
  • Polysiloxane copolymers would not normally be considered as suitable components for closed cell phenolic foams. We have however, surprisingly found that certain polysiloxane copolymers can be effectively used as surfactants in producing closed cell phenolic foams.
  • the closed cell value may be measured by the method described in B.S. 4370/ASTM D2856.
  • the foam of the invention has a closed cell content of greater than 90% when measured by this method.
  • the ⁇ (or k) value is measured as described in method 7A of B.S. 4370 part 2 with reference to BS3927. ASTM C177 is equivalent.
  • the preferred foam of the invention has a ⁇ value at 30 days or longer of less than about 0.018 W/m.K. Even more surprisingly the thermal conductivity remains stable when tested at high temperatures of about 70°C over prolonged periods, which is the preferred temperature to accelerate ⁇ -ageing of foams in the European standard EN 13166.
  • Foams were manufactured in the laboratory using the formulations below. The chemicals were mixed by means of a high speed laboratory stirrer and poured into an open topped mould, with an approximate volume of 1 litre. The mould was then placed in an oven at 55 °C for a minimum of 3 hours. The foam was then de-moulded and allowed to cool to ambient temperature before cutting and testing.
  • the surfactants used in the above examples are each polysiloxane copolymers available from OSi (Crompton Corporation). Nia L6915
  • Discontinuous block foam was manufactured on a commercial scale plant to produce blocks of dimensions approximately 2500 x 1000 x 1000 mm.
  • the foam mix was dispensed through a low pressure mixer into a heated mould.
  • the product was put through a three hour curing cycle prior to de-mould.
  • the foam was manufactured according to the following formulation.
  • the density of the foam thus formed was 35 kg/m 3 and the foam of this example has excellent thermal conductivity stability as follows:
  • HCFC's used in the phenolic foam blowing agent blend of the invention may be selected, or example, from one or more of:
  • blowing agent blend may include a suitable hydrogenated fluorocarbon selected, for example, from one or more of:
  • the HFC's may be represented by the formula C H P FQ whenever:
  • R is an integer from 1 to 4
  • P is an integer from 1 to 5
  • Q (2R+2)-P for an open chain HFC and (2R-P) for a cyclic HFC.
  • the phenolic foam blowing agent blend may include an alkane, especially n-pentane and/or iso-pentane, and/or a cycloalkane, especially cyclo-pentane, or be purely alkane based.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

A phenolic foam mixture for producing a substantially closed cell phenolic foam comprises a phenolic resin, a polysiloxane copolymer used as a surfactant, a blowing agent, and a catalyst (polymerization initiator), the polysiloxane copolymer having a polysiloxane content of from 25% to 35% by weight, a polyethylene oxide content of from 50% to 55% by weight and a polypropylene oxide content of from 15% to 20% by weight.

Description

" A PHENOLIC FOAM"
Introduction
The invention relates to a closed cell phenolic foam and to foam mixtures used in producing such foams.
Phenolic foams are widely used in building applications in view of their thermal insulation and fire resistant properties. Such phenolic foams are generally prepared by mixing a phenol formaldehyde resin with a blowing agent, a cell stabliliser and a hardener.
EP - A - 0170357 describes one such process for preparing a phenolic foam using Freon as a blowing agent, aqueous sulphuric acid as a hardener, and a cell stabiliser derived by oxylating castor oil with ethylene oxide or mixtures thereof with propylene oxide. Freon is a particular chlorofluorocarbon (CFC).
EP-A-0439283 describes the use of a complex blend of materials as an alternative blowing agent to a CFC. The blend comprises: at least one perfluoroalkane (PFA) (especially perfluoropentane, perfluorohexane or perfluoroheptane); and at least one component selected from a hydrogenated chlorofluorocarbon (HFC) and a specific alkane or cycloalkane.
US 4,530,939 describes a process for preparing a foam material wherein a phenol- aldehyde resole resin, a blowing agent and a surfactant are mixed with an acid catalyst to form an admixture which is poured into a forming means and cured. The resole resin is stripped using a solvent to reduce viscosity and water content. An unbranched dihydroxy either polyglycol is added to the stripped resole resin. The surfactant used in the process is an alkyl siloxane alkylene oxide block copolymer. The blowing agent is trichloromethane. US 3,271,331 describes a mixture for use in producing a foamed phenol-aldehyde resole resin. The mixture comprises a phenol-aldehyde resole resin and a siloxane- oxyalkylene copolymer as a foam stabiliser for the foamed phenol-aldehyde resole resin. Crosslinking compounds and modifiers are also added to the mixture.
EP 0899291 describes a thermoplastic resin composition comprising a thermoplastic resin and a clay composite. The clay composite is prepared by introducing a silane compound into a swellable silicate.
There is a need for an improved phenolic foam which is easily processed and has good long term aged thermal conductivity properties.
Statements of Invention
According to the invention there is provided a phenolic foam mixture for producing a substantially closed cell phenolic foam comprising a phenolic resin, a polysiloxane copolymer used as a surfactant, a blowing agent, and a catalyst (polymerization initiator), the polysiloxane copolymer having:-
a polysiloxane content of from 25% to 35% by weight;
an polyethylene oxide content of from 50% to 55% by weight; and
a polypropylene oxide content of from 15% to 20% by weight.
The improved phenolic foam of the invention is easily processed and has good long term aged thermal conductivity properties. In the invention a polysiloxane cell stabiliser as defined is used at a low addition level. In one embodiment of the invention the polysiloxane content of the surfactant is from 28% to 32% by weight.
The polyethylene oxide content of the surfactant is preferably from 51% to 55% by weight.
The polypropylene oxide content of the surfactant is preferably from 16% to 18% by weight.
In one embodiment the surfactant has a polysiloxane content of approximately 28% by weight, a polyethylene oxide content of approximately 55% by weight and a polypropylene oxide content of approximately 18% by weight.
In another embodiment the surfactant has a polysiloxane content of approximately 30% by weight, a polyethylene oxide content of approximately 53% by weight, and a polypropylene oxide content of approximately 17% by weight.
In a further embodiment the surfactant has a polysiloxane content of approximately 32% by weight, a polyethylene oxide content of approximately 51% by weight, and a polypropylene oxide content of approximately 16% by weight.
The surfactant may be present in an amount of at least 0.5 parts by weight of the mixture.
The invention also provides the use of a surfactant having:-
a polysiloxane content of from 25% to 35% by weight;
a polyethylene oxide content of from 50% to 55% by weight; and
a polypropylene oxide content of from 15% to 20% by weight in the manufacture of a substantially closed cell phenolic insulating foam. The surfactant is preferably as defined above.
In another aspect the invention provides a phenolic insulating foam with a closed cell content of at least 90% prepared from the foam mixture of the invention.
Detailed Description
The invention will be more clearly understood from the following description thereof given by way of example.
The invention is based on the surprising finding that closed cell phenolic foams can be produced by using relatively small quantities of specific polysiloxane copolymers as surfactants.
Polysiloxane copolymers would not normally be considered as suitable components for closed cell phenolic foams. We have however, surprisingly found that certain polysiloxane copolymers can be effectively used as surfactants in producing closed cell phenolic foams.
We have found that not only is a highly closed cell foam produced using the polysiloxane copolymers but also the foam produced has an extremely favourable stable thermal conductivity profile, and can be used effectively at a lower level than castor-oil based surfactants.
The closed cell value may be measured by the method described in B.S. 4370/ASTM D2856. The foam of the invention has a closed cell content of greater than 90% when measured by this method. The λ (or k) value is measured as described in method 7A of B.S. 4370 part 2 with reference to BS3927. ASTM C177 is equivalent. The preferred foam of the invention has a λ value at 30 days or longer of less than about 0.018 W/m.K. Even more surprisingly the thermal conductivity remains stable when tested at high temperatures of about 70°C over prolonged periods, which is the preferred temperature to accelerate λ-ageing of foams in the European standard EN 13166.
Example 1 ;
Foams were manufactured in the laboratory using the formulations below. The chemicals were mixed by means of a high speed laboratory stirrer and poured into an open topped mould, with an approximate volume of 1 litre. The mould was then placed in an oven at 55 °C for a minimum of 3 hours. The foam was then de-moulded and allowed to cool to ambient temperature before cutting and testing.
The surfactants used in the above examples are each polysiloxane copolymers available from OSi (Crompton Corporation). Nia L6915
This is a polysiloxane copolymer having: -
a polysiloxane content of approximately 32% by weight
a polyethylene oxide content of approximately 51% by weight
a polypropylene oxide content of approximately 16% by weight
Niax SR-355
This is a polysiloxane copolymer having: -
- a polysiloxane content of approximately 28% by weight
a polyethylene oxide content of approximately 55% by weight
- a polypropylene oxide content of approximately 18% by weight
Niax Yl 0733
This is a polysiloxane copolymer having: -
- a polysiloxane content of approximately 30% by weight
a polyethylene oxide content of approximately 53% by weight
a polypropylene oxide content of approximately 17% by weight Niax L6910
This is a polysiloxane copolymer having: -
a polysiloxane content of approximately 48% by weight
a polyethylene oxide content of approximately 38% by weight
a polypropylene oxide content of approximately 13% by weight
Thermal conductivity measurements were made on samples aged for various periods of time at 70 °C. The results are shown in the table below. It is clear that a rapid increase in thermal conductivity occurred in the case or Foam D, which was produced with a surfactant not having the claimed properties. Whereas foams A, B and C, which were produced with surfactants having the claimed properties, exhibited good thermal conductivity stability.
Example 2:
Discontinuous block foam, was manufactured on a commercial scale plant to produce blocks of dimensions approximately 2500 x 1000 x 1000 mm. The foam mix was dispensed through a low pressure mixer into a heated mould. The product was put through a three hour curing cycle prior to de-mould. The foam was manufactured according to the following formulation.
Phenolic resin 100 pbw
Blowing agent HCFC141b Magex 12 pbw
Surfactant Y10773 2 pbw
Colour KDS Black 0.3 pbw
Catalyst PSA/Phosphoric Acid 10 pbw
The density of the foam thus formed was 35 kg/m3 and the foam of this example has excellent thermal conductivity stability as follows:
Closed cell content as measured on a Micromeretics AccuPyc 1330 was 96.4%.
It is envisaged that the HCFC's used in the phenolic foam blowing agent blend of the invention may be selected, or example, from one or more of:
HCFC 141b CC12F-CH3 HCFC 142b CH3CC1F2 HCFC 123 CF3-CHC12 HCFC 124 CHC1F2 HCFC 225ca CHC12-CF2-CF3 HCFC 225cb CC1F2-CF2-CHC1F It is also envisaged that the blowing agent blend may include a suitable hydrogenated fluorocarbon selected, for example, from one or more of:
HFC 125 CHF2-CH3 HFC 134 a CF3CH2F
HFC 152 a CH3-CHF2
HFC 245fa CF3-CH2-CHF2
HFC 365mfc CF3-CH2-CF2-CH3
The HFC's may be represented by the formula C HPFQ whenever:
R is an integer from 1 to 4 P is an integer from 1 to 5 and Q = (2R+2)-P for an open chain HFC and (2R-P) for a cyclic HFC.
It is further envisaged that the phenolic foam blowing agent blend may include an alkane, especially n-pentane and/or iso-pentane, and/or a cycloalkane, especially cyclo-pentane, or be purely alkane based.
The invention is not limited to the embodiments hereinbefore described which may be varied in detail.

Claims

1. A phenolic foam mixture for producing a substantially closed cell phenolic foam comprising a phenolic resin, a polysiloxane copolymer used as a surfactant, a blowing agent, and a catalyst (polymerization initiator), the polysiloxane copolymer having:-
a polysiloxane content of from 25% to 35% by weight;
a polyethylene oxide content of from 50% to 55% by weight; and
a polypropylene oxide content of from 15% to 20% by weight.
2. A foam mixture as claimed in claim 1 wherein the polysiloxane content of the surfactant is from 28% to 32% by weight.
3. A foam mixture as claimed in claim 1 or 2 wherein the polyethylene oxide content of the surfactant is from 51% to 55% by weight.
4. A foam mixture as claimed in any of claims 1 to 3 wherein the polypropylene oxide content of the surfactant is from 16% to 18% by weight.
5. A foam mixture as claimed in any preceding claim wherein the surfactant has a polysiloxane content of approximately 28% by weight, a polyethylene oxide content of approximately 55% by weight and a polypropylene oxide content of approximately 18% by weight.
6. A foam mixture as claimed in any of claims 1 to 4 wherein the surfactant has a polysiloxane content of approximately 30% by weight, a polyethylene oxide content of approximately 53% by weight, and a polypropylene oxide content of approximately 17% by weight.
7. A foam mixture as claimed in any of claims 1 to 4 wherein the surfactant has a polysiloxane content of approximately 32% by weight, a polyethylene oxide content of approximately 51% by weight, and a polypropylene oxide content of approximately 16% by weight.
8. A foam mixture as claimed in any preceding claim wherein the surfactant is present in an amount of at least 0.5 parts by weight of the mixture.
9. Use of a surfactant having:-
a polysiloxane content of from 25% to 35% by weight;
a polyethylene oxide content of from 50% to 55% by weight; and
a polypropylene oxide content of from 15% to 20% by weight
in the manufacture of a substantially closed cell phenolic insulating foam.
10. Use as claimed in claim 9 wherein the surfactant is as defined in any of claims
2 to 7.
11. A phenolic insulating foam with a closed cell content of at least 90% prepared from the foam mixture as defined in any of the claims 1 to 8.
12. A foam mixture substantially as hereinbefore described with reference to the examples.
13. Use of a surfactant substantially as hereinbefore described with reference to the examples.
4. A phenolic insulating foam substantially as hereinbefore described with reference to the examples.
EP03780560A 2002-12-20 2003-12-22 A closed cell phenolic foam Withdrawn EP1572790A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IE20020986 2002-12-20
IE20020986 2002-12-20
PCT/IE2003/000175 WO2004056911A2 (en) 2002-12-20 2003-12-22 A closed cell phenolic foam

Publications (1)

Publication Number Publication Date
EP1572790A2 true EP1572790A2 (en) 2005-09-14

Family

ID=30776578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03780560A Withdrawn EP1572790A2 (en) 2002-12-20 2003-12-22 A closed cell phenolic foam

Country Status (5)

Country Link
EP (1) EP1572790A2 (en)
AU (1) AU2003288485A1 (en)
GB (1) GB2398570B (en)
PL (1) PL375897A1 (en)
WO (1) WO2004056911A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2565331B (en) * 2017-08-10 2019-08-14 Kingspan Holdings Irl Ltd Phenolic foam and method of manufacture thereof
GB2598566A (en) * 2020-08-31 2022-03-09 Kingspan Holdings Irl Ltd Phenolic foam

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271331A (en) * 1963-10-10 1966-09-06 Union Carbide Corp Phenolic foams stabilized by siloxane-oxyalkylene copolymers
US4070313A (en) * 1976-01-16 1978-01-24 Union Carbide Corporation Non punking phenolic foam
US4205135A (en) * 1976-03-18 1980-05-27 The Celotex Corporation Closed cell phenolic foam
US4530939A (en) * 1982-02-11 1985-07-23 The Dow Chemical Company Low K-factor closed cell phenol-aldehyde foam and process for preparation thereof
JPS62501077A (en) * 1985-06-10 1987-04-30 ザ　ダウ　ケミカル　カンパニ− Method for producing closed-cell phenolaldehyde foam with low K factor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004056911A2 *

Also Published As

Publication number Publication date
GB0329775D0 (en) 2004-01-28
AU2003288485A8 (en) 2004-07-14
GB2398570B (en) 2006-01-11
GB2398570A (en) 2004-08-25
WO2004056911A3 (en) 2004-09-10
AU2003288485A1 (en) 2004-07-14
IE20030957A1 (en) 2004-06-30
PL375897A1 (en) 2005-12-12
WO2004056911A2 (en) 2004-07-08

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