Process of the preparation of modified polyisocyanurate foams for heat insulation materials
AssigneesDaido Steel Sheet Corporation, Nisshinbo Industries, Inc.
InventorsMorihiro Matsumoto, Noboru Yoshida, Kiyotake Morimoto, Satoshi Nakamura
Life of this patent
Estimating the term…
Abstract
A process of the preparation of the modified polyisocyanurate foams provided by a reaction of a polyisocyanate with a polyol composition mixture comprising a polyol, water, a trimerization catalyst, a carbodiimide catalyst, and an aromatic compound used as a chain extender. An amount of the aromatic compound used in the preparation is 0.5 to 10.0% by weight with respect to a total weight of the polyisocyanate and the polyol mixture.
Claims11
A process of preparing a foam of modified polyisocyanurate comprising mixing a polyisocyanate, a polyol, and water in the presence of a first catalyst promoting the formation of isocyanurate linkages, and a second catalyst, comprising phospholene oxide, promoting the formation of carbodiimide linkages and the generation of carbon dioxide as a blowing agent, and an aromatic compound which is different from said polyol and is represented by at least one compound of the following formula (I) and (II):
- ##STR8## wherein R.sub.1 and R.sub.2 represents at least one of H and --CH.sub.3, R.sub.3 and R.sub.4 represent at least one of the following (.alpha.) and (.beta.):
- ##STR9## R.sub.5 and R.sub.6 represent the same or different C.sub.1 -C.sub.4 alkyl groups, and n represents an integer from 1 to 4;
- and
- reacting said mixture in the substantial absence of a chlorofluorohydrocarbon (CFC) blowing agent to form a foam with improved adhesion, improved compression strength and reduced friability and properties which are at least comparable to these characteristics in similar foams made with chlorofluorohydrocarbon blowing agents.
A polyol composition, adapted to react with a polyisocyanate, which consists essentially of:
- a polyol;
- water;
- an aromatic compound which is different from said polyol represented by at least one of the following formula (I) and (II):
- ##STR11## wherein R.sub.1 and R.sub.2 represent at least one of the following (.alpha.) and (.beta.):
- ##STR12## R.sub.5 and R.sub.6 represent the same or different C.sub.1 -C.sub.4 alkyl groups, and n represents an integer from 1 to 4:
- a first catalyst for promoting the formulation of isocyanurate linkages;
- and
- a second catalyst of phospholene oxide for promoting the formation of carbodiimide linkages,
- wherein said second catalyst is at least one of those represented by the following formulae (III) and (IV):
- ##STR13## wherein R.sub.7 represents the same or different substituted or unsubstituted alkyl, phenyl, naphthyl, or benzyl groups;
- and R.sub.8, R.sub.9, R.sub.10, R.sub.11, R.sub.12, and R.sub.13 represent the same or different hydrogen, chloride, or alkyl groups having a carbon number of 1 to 4.
Dependencies are inferred from the claim text.