FOAM AND LAMINATE

FOAM AND LAMINATE

PROBLEM TO BE SOLVED: To obtain a foamed product containing structural units originating from a hydroxycarboxylic acid component and structural units originating from a molecular weight-enhancing agent and/or a polymerization catalyst- inactivating agent, excellent in foamability, moldability, impac...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KAKIZAWA YASUTOSHI, SHIKATA NORIKI
Format: Patent
Sprache:eng
Schlagworte:
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
GENERAL PROCESSES OF COMPOUNDING
LAYERED PRODUCTS
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
WORKING-UP
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To obtain a foamed product containing structural units originating from a hydroxycarboxylic acid component and structural units originating from a molecular weight-enhancing agent and/or a polymerization catalyst- inactivating agent, excellent in foamability, moldability, impact resistance, etc., and having biodegradability, and further to obtain a laminate. SOLUTION: A hydroxycarboxylic acid polyester containing (A) structural units originating from a hydroxycarboxylic acid, (B) structural units originating from a molecular weight-enhancing agent and/or (C) structural units originated from a polymerization catalyst-inactivating agent and having a weight-average mol.wt. of 20000-400000 is foamed. The polyester preferably further contains (D) structural units originating from a dicarboxylic acid and (E) structural units originating from a diol. The component A is preferably originating from lactic acid. The component C is preferably a chelating agent and/or an acidic phosphoric ester component. A laminate comprising a foam layer produced from the foam and a biodegradable non-foamed layer and excellent in transparency can be obtained.