US10323355B2 – June 18, 2019 – Composite material comprising bio-filler and specific polymer

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Inventors :

Albert Henderikus Alberts; Gad Rothenberg

Owner :

C08L97 / 02; C08J5 / 04; C08J5 / 24; C08L1 / 02; C08L67 / 00; C08L97 / 00; C09K21 / 14; D21H17 / 53

Application Number :

US16021387

Document Number :

US10323355B2

Priority Date :

January 1, 1970

Filing Date :

June 28, 2018

Date of Grant/ Publication :

June 18, 2019

Class :

PLANTICS B.V.

Abstract

A composite material comprising 10-98 wt. % of a bio-based particulate or fibrous filler and at least 2 wt. % of a polyester derived from an aliphatic polyalcohol with 2-15 carbon atoms and a polyacid, wherein the polyacid comprises at least 10 wt. % of tricarboxylic acid. Preferably, the filler is in the form of particles, fibers, and/or random or non-random layers. A plant-based filler may be used, in particular a cellulosic or lignocellulosic material, more in particular one or more materials selected from wood chips, wood flakes, sawdust, pulp, e.g., pulp of (recycled) paper or other fiber pulp, and plant-derived fibers such as cotton, linen, flax, and hemp. An animal-derived filler, in particular an animal-derived fiber such as wool, hair, silk, or feathers may also be used. Preferably the polyalcohol is selected from one or more of glycerol, sorbitol, xylitol, mannitol, 1,2-propane diol, 1,3-propane diol, and 1,2-ethane diol, in particular glycerol. The polyacid preferably is an aliphatic diacid or triacid with 3-15 carbon atoms. Examples of suitable acids include citric acid, succinic acid, and itaconic acid. The composite material according to the invention has fire-retardant properties, which makes it particularly suitable for applications where fire-retardancy is an issue.

Claim(s)

1. A composite material comprising from 10 to 98 wt. % of a bio-based particulate or fibrous filler and at least 2 wt. % of a polyester derived from an aliphatic polyalcohol with from 2 to 15 carbon atoms and a polyacid, wherein the polyacid comprises at least 70 wt. % of tricarboxylic acid.

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