Process of making lignocellulosic articles
AssigneeBASF SE
InventorsDonald C. Mente, Li-Mei Lu
Life of this patent
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Abstract
A method is disclosed for preparing compression molded or pressed lignocellulosic articles. The method involves forming a binder resin by combining a polyisocyanate component with a synergist component of a C1 to C4 N-alkyl pyrrolidone, gamma-butyrolactone, or mixtures thereof. A resinated lignocellulosic mixture is formed by combining the binder resin with lignocellulosic particles having a moisture content of from 2 to 15 weight percent. The compression molded or pressed lignocellulosic article is formed by compressing the resinated lignocellulosic mixture.
Claims26
A method for preparing a compression molded or pressed lignocellulosic article comprising the steps of:
- a) forming a binder resin by combining from about 75 to 98.0 weight percent based on the total weight of the binder resin of a polyisocyanate component with from about 25 to 2.0 weight percent based on the total weight of the binder resin of a synergist component selected from the group consisting of a C1 to C4 N-alkyl pyrrolidone, gamma-butyrolactone, and mixtures thereof;
- b) forming a resinated lignocellulosic mixture by combining from about 1 to 20 weight percent based on the total weight of the lignocellulosic mixture of the binder resin with from about 99 to 80 weight percent based on the total weight of the lignocellulosic mixture of lignocellulosic particles, the lignocellulosic particles having a moisture content of from 2 to 15 weight percent;
- and
- c) forming a compression molded or pressed lignocellulosic article by compressing the resinated lignocellulosic mixture at an elevated temperature and under pressure.
A method for preparing a compression molded or pressed lignocellulosic article comprising the steps of:
- a) forming a binder resin by combining from about 75 to 98.0 weight percent based on the total weight of the binder resin of a polyisocyanate component selected from the group consisting of diphenylmethane-2,2′-diisocyanate, diphenylmethane-2,4′-diisocyanate, diphenylmethane-4,4′-diisocyanate, polymeric diphenylmethane-diisocyanate, and mixtures thereof with from about 25 to 2.0 weight percent based on the total weight of the binder resin of a synergist component selected from the group consisting of a C1 to C4 N-alkyl pyrrolidone, gamma-butyrolactone, and mixtures thereof;
- b) forming a resinated lignocellulosic mixture by combining from about 1 to 20 weight percent based on the total weight of the lignocellulosic mixture of the binder resin with from about 99 to 80 weight percent based on the total weight of the lignocellulosic mixture of lignocellulosic particles, the lignocellulosic particles having a moisture content of from 10 to 15 weight percent;
- and
- c) forming a compression molded or pressed lignocellulosic article by compressing the resinated lignocellulosic mixture at an elevated temperature and under pressure.
Dependencies are inferred from the claim text.