EP0177647A2
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EP
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Preparation of lignocellulosic isocyanate molded compositions using a copolymer of a functional polysiloxane and a carboxylic acid or salt thereof as release agent
Assignee: Lyondell Chemical Technology LP
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Filing: 1984-10-05
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Granted: —
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Expires: 2004-10-05
Abstract
Abstract In the compression molding of lignocellulosic composite articles, such as particle or flake baord, in which polyisocyanate binder systems are employed, a copolymeric reaction product of a hydroxy - or carboxy - containing polysiloxane and a monocarboxylic acid or metal salt thereof is provided as release agent on the mold surfaces to give multiple release. Optionally organopoly-siloxane fluid may be employed along with the copolymer as a diluent.
Inventors
- 👤 Tinh Nguyen
- 👤 James M. Gaul
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 00:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/703; C08G18/705; C08G18/706; B; B27; B27N; B27N3/00; B27N3/08; B27N3/083; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/64; C08L; C08L97/00; C08L97/02; B29K; B29K2503/00; C08G2125/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
172 words
A process for the preparation of lignocellulosic composite molded articles wherein lignocellulosic particles are contacted with an organic polyisocyanate-based binder composition and the treated particles are subsequently formed into molded articles by the application of heat and pressure, characterised in that a film coating of a copolymeric reaction product of a functional polysiloxane and a monocarboxylic acid or metal salt thereof is applied to the mold surface or surfaces to facilitate release of the lignocellulosic molded article, said functional polysiloxane having the formula: wherein n is an integer of from 5 to 30, m is an integer of from 1 to 20 and X is a group selected from -CH 2 0H, -CH(CH 3 )OH, -C( C H 3 ) OH, -COOH or -OH, said monocarboxylic acid or metal salt thereof being a compound having the formula CH 3 -(CH 2 )y-COOZ wherein y is an integer of from 5 to 24 and Z is selected from Hydrogen, Na, Li, Ca, Ba, Cd, Mg, K and Fe, or a hydroxy-substituted derivative thereof.
Claim 2
Dependent Claim
172 words
A process for the preparation of lignocellulosic composite molded articles wherein lignocellulosic particles are contacted with an organic polyisocyanate-based binder composition and the treated particles are subsequently formed into molded articles by the application of heat and pressure, characterised in that a film coating of a copolymeric reaction product of a functional polysiloxane and a monocarboxylic acid or metal salt thereof is applied to the mold surface or surfaces to facilitate release of the lignocellulosic molded article, said functional polysiloxane having the formula: wherein n is an integer of from 5 to 30, m is an integer of from 1 to 20 and X is a group selected from -CH 2 0H, -CH(CH 3 )OH, -C( C H 3 ) OH, -COOH or -OH, said monocarboxylic acid or metal salt thereof being a compound having the formula CH 3 -(CH 2 )y-COOZ wherein y is an integer of from 5 to 24 and Z is selected from Hydrogen, Na, Li, Ca, Ba, Cd, Mg, K and Fe, or a hydroxy-substituted derivative thereof.
Claim 3
Dependent Claim
14 words
A process accbrding to Claim 1 wherein the lignocellulosic composite article is particle board.
Claim 4
Dependent Claim
52 words
A process according to Claim 1 or Claim 2, wherein the lignocellulosic composite is compressed between metal platens at a temperature of from about 40°C. to 220°C. and a pressure of from about 100 psi to 600 psi for a period of from 1 to 10 minutes, preferably 3 to 5 minutes.
Claim 5
Dependent Claim
42 words
A process according to Claim 1 wherein the coated mold surface or surfaces are heated at a temperature of from about 75°C. to 200°C. for a period of from about 1 to 5 minutes prior to preparation of lignocellulosic composite molded articles.
Claim 6
Dependent Claim
36 words
A process according to any one of Claims 1 to 4 wherein the organic polyisocyanate binder is selected from diphenylmethane diisocyanate and polymethylene polyphenyl polyisocyanates containing from about 20 to 85 percent by weight diphenylmethane diisocyanate.
Claim 7
Dependent Claim
29 words
A process according to any one of Claims 1 to 5 wherein the functional polysiloxane is -CH 2 0H terminated, -C(CH 3 ) 2 0H terminated or -COOH terminated.
Claim 8
Dependent Claim
29 words
A process according to any one of Claims 1 to 6 wherein the monocarboxylic acid of the copolymer is selected from 12-hydroxy stearic acids, palmitic acid and stearic acid.
Claim 9
Dependent Claim
26 words
A process according to any one of Claims 1 to 7 wherein the monocarboxylic acid salt is selected from calcium stearate, iron stearate and potassium oleate.
Claim 10
Dependent Claim
33 words
A process according to any one of the preceding claims wherein the copolymeric reaction product is applied in admixture with a solvent which is preferably selected from toluene and isobutanol and mixtures thereof.
Claim 11
Dependent Claim
45 words
A process according to Claim 1 wherein organopoly- siloxane fluids is added as diluent in an amount of up to 25 per cent, and preferably between 10 and 20 per cent, by weight, based on the mixture of said fluids and the copolymeric reaction product.
Claim 12
Dependent Claim
20 words
A moulded article, e.g. a composition board product, obtained by the process claimed in any one of the preceding claims.
Claim 13
Dependent Claim
22 words
As a novel composition of matter, a copolymeric reaction product as specified in any one of claims 1, 6, 7 and 8.
References Cited (Backward Citations)
No citation records indexed.
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