US 2023/0399489 A1Published application

Heat stabilizer for polymer processing using phosphate with suppressed crystallinity, and method for preparing the same

AssigneeIndustry-Academic Cooperation Foundation, Yeungnam University

InventorsSeong Cheol KIM, Periyasamy THIRUKUMARAN

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Abstract

Proposed is a heat stabilizer for polymer processing, the heat stabilizer being represented by Aw(PO4)x(HPO4)yXz·nH2O, having excellent thermal stability capable of preventing discoloration of a polymer when processing a polymer such as PVC, and being applicable to various polymers aside from PVC. In addition, the present disclosure provides an effective method of preparing a heat stabilizer preventing discoloration when processing a polymer by the following method: lowering the crystallinity of a metal phosphate by replacing with various metal cations, changing the type and content of anion, and using various dispersants serving as ligands; or reducing the particle size by adjusting the pH using a strong base and by performing a rapid synthesis process.

Claims11

Dependent claims

A heat stabilizer for polymer processing, the heat stabilizer being represented by the following chemical formula:

Aw(PO4)x(HPO4)yXz·nH2O
in the chemical formula, A is at least one type of polyvalent cation selected from the group Ca, Mg, Al, Fe, Ti, Sn, Ba, Zn, Cu, Cd, Pb, Mn, Ni, Sr, and Mo;
w satisfies a range of 2 to 5,
X is at least one type of anion selected from the group consisting of Cl−, Br−, NO3−, OH−, acetate, cyanide, thiocyanate, isocyanate, hydrogensulfate, dihydrogen phosphate, phosphite, polyphosphate, carbonate, sulfonate, borate, carbonate, sulfate, carboxylate, adipate, dodecylsulfate, nitrate, and P2O74−,
z is in a range of 0 to 3,
x and y are each independently a number in the range of 0 to 5,
there is no case that both of x and y are 0 at the same time, either x or y is not 0, and
in the chemical formula, w, x, y, and z satisfy an expression of 2w=3x+2y+1z when X is a monovalent anion but satisfy an expression of 2w=3x+2y+0.5z is satisfied when X is a divalent anion, and n is an integer in the range of 0 to 12.

5 more elements

Dependencies are inferred from the claim text.