Stabilization of wood substrates
AssigneeCiba Specialty Chemicals Corporation
InventorsThomas Bolle, Jean-Pierre Wolf, Raymond Seltzer
Life of this patent
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Abstract
The invention relates to a method of protecting wood against light-induced degradation by treatment with a stain or impregnation which penetrates the surface of the wood comprising a) at least one organic solvent; b) a hindered amine compound of formula I or II where G1 and G2 are independently alkyl of 1 to 4 carbon atoms or are together pentamethylene, Z1 and Z2 are each methyl, or Z1 and Z2 together form a linking moiety which may additionally be substituted by an ester, ether, hydroxy, oxo, cyanohydrin, amide, amino, carboxy or urethane group, E is oxyl or hydroxyl, X is an inorganic or organic anion, and where the total charge of cations h is equal to the total charge of anions j.
Claims7
A method of protecting wood against light-induced degradation by treatment with a stain or impregnation which penetrates the surface of the wood comprising
- a) at least one organic solvent, and
- b) a hindered amine compound which is
- (a) bis(1-oxyl-2,2-6-6-tetramethylpiperidin-4-yl) sebacate;
- (b) bis(1-hydroxy-2,2-6-6-tetramethylpiperidin-4-yl) sebacate;
- (c) 1-hydroxy-2,2-6-6-tetramethyl-4-acetoxypiperidinium citrate;
- (d) 1-oxyl-2,2,6,6-tetramethyl-4-acetamidopiperidine;
- (e) 1-hydroxy-2,2,6,6-tetramethyl-4-acetamidopiperidine;
- (f) 1-hydroxy-2,2,6,6-tetramethyl-4-acetamidopiperidinium bisulfate;
- (g) 1-oxyl-2,2,6,6-tetramethyl-4-oxo-piperidine;
- (h) 1-hydroxy -2,2,6,6-tetramethyl-4-oxo-piperidine;
- (i) 1-hydroxy -2,2,6,6-tetramethyl-4-oxo-piperidinium acetate;
- (j) 1-oxyl-2,2,6,6-tetramethyl-4-methoxy-piperidine;
- (k) 1-hydroxy-2,2,6,6-tetramethyl-4-methoxy-piperidine;
- (l) 1-hydroxyl-2,2,6,6-tetramethyl-4-methoxy-piperidinium acetate;
- (m) 1-oxyl-2,2,6,6-tetramethyl-4-acetoxypiperidine;
- (n) 1-hydroxy-2,2,6,6-tetramethyl-4-acetoxypiperidine;
- (o) 1-oxyl-2,2,6,6-tetramethyl-4-propoxy-piperidine;
- (p) 1-hydroxy-2,2,6,6-tetramethyl-4-propoxy-piperidinium acetate;
- (q) 1-hydroxy-2,2,6,6-tetramethyl-4-propoxy-piperidine;
- (r) 1-oxyl-2,2,6,6-tetramethyl-4-(2-hydroxy-4-oxapentoxy)piperidine;
- (s) 1-hydroxy-2,2,6,6-tetramethyl-4-(2-hydroxy-4-oxapentoxy)piperidinium acetate;
- (t) 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine;
- (u) 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidine;
- (v) 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium chloride;
- (w) 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium acetate;
- (x) 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium bisulfate;
- (y) 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium citrate;
- (z) bis(1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium) citrate;
- (aa) tris(1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium) citrate;
- (bb) tetra(1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium) ethylenediaminetetraacetate;
- (cc) tetra(1-hydroxy-2,2,6,6-tetramethyl-4-acetamidopiperidinium) ethylenediaminetetraacetate;
- (dd) tetra(1-hydroxy-2,2,6,6-tetramethyl-4-oxopiperidinium) ethylenediaminetetraacetate;
- (ee) penta(1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium) diethylenetriaminepentaacetate;
- (ff) penta(1-hydroxy-2,2,6,6-tetramethyl-4-acetamidopiperidinium) diethylenetriaminepentaacetate;
- (gg) penta(1-hydroxy-2,2,6,6-tetramethyl-4-oxopiperidinium) diethylenetriaminepentaacetate;
- (hh) tri(1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium) nitrilotriacetate;
- (ii) tri(1-hydroxy-2,2,6,6-tetramethyl-4-acetamidopiperidinium) nitrilotriacetate;
- jj) tri(1-hydroxy-2,2,6,6-tetramethyl-4-oxopiperidinium) nitrilotriacetate;
- (kk) penta(1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium) diethylenetriaminepentamethylenephosphonate;
- (ll) penta(1-hydroxy-2,2,6,6-tetramethyl-4-acetamidopiperidinium) diethylenetriaminepentamethylenephosphonate;
- or
- (mm) penta(1-hydroxy-2,2,6,6-tetramethyl-4-oxopiperidinium) diethylenetriaminepentamethylenephosphonate.
Dependencies are inferred from the claim text.