EP0289142A2
Expired / Lapsed
EP
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Polyacetal molding compositions
Assignee: CNA Holdings LLC
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Filing: 1988-03-30
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Granted: —
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Expires: 2008-03-30
Abstract
Abstract An improved polyacetal molding resin includes a plurality of stabilizers to enhance properties. The composition includes at least about 90 wt. percent acetal polymer, a lubricant, a hindered phenol as an antioxidant and synergistic amounts of a metal hydroxy carboxylate and a nitrogen containing stabilizer selected from the group consisting of amidine and terpolymers of caprolactam, hexamethylene diamine adipate, and hexamethylene diamine sebacate. In certain aspects of the invention, there is provided antistatic agents such as polyethylene glycol and glyceryl monostearate.
Inventors
- 👤 Kavilipalayam M. Natarajan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:38
CPC Classifications
C; C08; C08K; C08K5/00; C08K13/00; C08K13/02; C08L; C08L59/00; C08L71/00; C08L71/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
178 words
A molding composition consisting of at least 90 percent by weight of a polyacetal resin, the balance being a property enhancing package melt blended therewith, said package comprising in combination: a hindered phenol as an anti-oxidant; a metal hydroxy carboxylate salt wherein said metal is selected from the group consisting of sodium, magnesium, calcium and potassium and wherein said hydroxy carboxylate is selected from the group consisting of hydroxy stearate, hydroxy laurate, hydroxy palmitate and hydroxy butyrate; a lubricant comprising one or more of an alkylene disstearamide, a long chain amide, a wax, an oil, or a polyether glycide; a nitrogen containing thermal stabilizer selected from the group consisting of amidines and terpolymers of caprolactam, hexamethylene diamine adipate, and hexamethylene diamine sebacate; a nucleant selected from the group consisting of sodium bicarbonate, finely divided polytetrafluoroethylene powder, talc, and terpolymers of trioxane, ethylene oxide and butanediol diglycidal ether; and as an antistatic agent, polyethylene glycol, a fatty acid ester of an alkylene glycol, a polypropylene glycol, a polyethylene-polypropylene copolymer glycol, lauric diethanol amide, diethanol lauryl amine or combinations thereof.
Claim 2
Dependent Claim
178 words
A molding composition consisting of at least 90 percent by weight of a polyacetal resin, the balance being a property enhancing package melt blended therewith, said package comprising in combination: a hindered phenol as an anti-oxidant; a metal hydroxy carboxylate salt wherein said metal is selected from the group consisting of sodium, magnesium, calcium and potassium and wherein said hydroxy carboxylate is selected from the group consisting of hydroxy stearate, hydroxy laurate, hydroxy palmitate and hydroxy butyrate; a lubricant comprising one or more of an alkylene disstearamide, a long chain amide, a wax, an oil, or a polyether glycide; a nitrogen containing thermal stabilizer selected from the group consisting of amidines and terpolymers of caprolactam, hexamethylene diamine adipate, and hexamethylene diamine sebacate; a nucleant selected from the group consisting of sodium bicarbonate, finely divided polytetrafluoroethylene powder, talc, and terpolymers of trioxane, ethylene oxide and butanediol diglycidal ether; and as an antistatic agent, polyethylene glycol, a fatty acid ester of an alkylene glycol, a polypropylene glycol, a polyethylene-polypropylene copolymer glycol, lauric diethanol amide, diethanol lauryl amine or combinations thereof.
Claim 3
Dependent Claim
57 words
The composition according to claim 1, wherein said polyacetal resin includes from about 0.4 to about 15 mole percent of -O-R units wherein R is a divalent radical containing at least two carbon atoms directly linked to each other and positioned in the chain between the two valences with any substituent in the R radical being inert.
Claim 4
Dependent Claim
22 words
The composition according to claim 1, wherein said polyacetal resin is prepared by copolymerizing trioxane with about two weight percent ethylene oxide.
Claim 5
Dependent Claim
67 words
The composition according to claim 1, wherein said polyacetal resin is a terpolymer prepared by reacting trioxane with a cyclic ether and a bifunctional compound selected from the group consisting of ethylene diglycide, diethers of 2 mols diglycidyl ether and 1 mol of formaldehyde, dioxane or trioxane, and diethers of 2 mols of glycide and 1 mol of an aliphatic diol with 2 to 8 carbon atoms.
Claim 6
Dependent Claim
12 words
The molding composition according to claim 1, wherein said amidine is cyanoguanidine.
Claim 7
Dependent Claim
29 words
The molding composition according to claim 5, wherein said composition includes from about 0.02 to about 0.05 percent by weight cyanoguanidine, based on the total weight of the composition.
Claim 8
Dependent Claim
11 words
The composition according to claim 1, wherein said amidine is melamine.
Claim 9
Dependent Claim
28 words
The composition according to claim 7, wherein said composition includes from about 0.01 to about 0.05 percent by weight melamine, based on the total weight of the composition.
Claim 10
Dependent Claim
46 words
The composition according to claim 1, wherein said antistatic agent consists essentially of a mixture of polyethylene glycol and glyceryl monostearate, which mixture is present in an amount of from about 0.4 to about 2 percent by weight, based on the total weight of the composition.
Claim 11
Dependent Claim
16 words
The composition according to claim 1, wherein said metal hydroxy carboxylate salt is calcium 12-hydroxy stearate.
Claim 12
Dependent Claim
173 words
In a polyacetal molding composition of the class including a hindered phenol as an antioxidant and one or more lubricants such as alkylene disstearamides, waxes, oils, long chain amides or polyether glycides, the combination comprising a metal hydroxy carboxylate, said metal being selected from the group consisting of sodium, potassium, magnesium or calcium; said hydroxy carboxylate being hydroxy stearate, hydroxy laurate, hydroxy palmitate or hydroxy butyrate, and a nitrogen containing stabilizer selected from the group consisting of amidines and terpolymers of caprolactam, hexamethylene diamine adipate, and hexamethylene diamine sebacate, and an antistatic agent selected from the group consisting of a polyethylene glycol, a fatty acid ester of an alkylene glycol, a polypropylene glycol, a polyethylene-polypropylene copolymer glycol, lauric diethanol amide, diethanol lauryl amine or combinations thereof, wherein said metal hydroxy carboxylate is present in an amount sufficient to constitute at least about 0.05 weight present of said composition and said nitrogen containing stabilizer is present in an amount such that it constitutes from about 0.01 to about 1 weight percent of said composition.
Claim 13
Dependent Claim
173 words
In a polyacetal molding composition of the class including a hindered phenol as an antioxidant and one or more lubricants such as alkylene disstearamides, waxes, oils, long chain amides or polyether glycides, the combination comprising a metal hydroxy carboxylate, said metal being selected from the group consisting of sodium, potassium, magnesium or calcium; said hydroxy carboxylate being hydroxy stearate, hydroxy laurate, hydroxy palmitate or hydroxy butyrate, and a nitrogen containing stabilizer selected from the group consisting of amidines and terpolymers of caprolactam, hexamethylene diamine adipate, and hexamethylene diamine sebacate, and an antistatic agent selected from the group consisting of a polyethylene glycol, a fatty acid ester of an alkylene glycol, a polypropylene glycol, a polyethylene-polypropylene copolymer glycol, lauric diethanol amide, diethanol lauryl amine or combinations thereof, wherein said metal hydroxy carboxylate is present in an amount sufficient to constitute at least about 0.05 weight present of said composition and said nitrogen containing stabilizer is present in an amount such that it constitutes from about 0.01 to about 1 weight percent of said composition.
Claim 14
Dependent Claim
57 words
The composition according to claim 11, wherein said polyacetal resin includes from about 0.4 to about 15 mole percent of -O-R units wherein R is a divalent radical containing at least two carbon atoms directly linked to each other and positioned in the chain between the two valences with any substituent in the R radical being inert.
Claim 15
Dependent Claim
22 words
The composition according to claim 11, wherein said polyacetal resin is prepared by copolymerizing trioxane with about two weight percent ethylene oxide.
Claim 16
Dependent Claim
69 words
The composition according to claim 11, wherein said polyacetal resin is a terpolymer prepared by reacting trioxane with a cyclic ether and a bifunctional compound selected from the group consisting of ethylene diglycide, diglycidyl ether, diethers of 2 mols of glycide and 1 mol of formaldehyde, dioxane or trioxane, and diethers of 2 mols of glycide and 1 mol of an aliphatic diol with 2 to 8 carbon atoms.
Claim 17
Dependent Claim
12 words
The molding composition according to claim 11, wherein said amidine is cyanoguanidine.
Claim 18
Dependent Claim
29 words
The molding composition according to claim 15, wherein said composition includes from about 0.02 to about 0.05 percent by weight cyanoguanidine based on the total weight of the composition.
Claim 19
Dependent Claim
11 words
The composition according to claim 11, wherein said amidine is melamine.
Claim 20
Dependent Claim
28 words
The composition according to claim 17, wherein said composition includes from about 0.01 to about 0.05 percent by weight melamine, based on the total weight of the composition.
Claim 21
Dependent Claim
46 words
The composition according to claim 11, wherein said antistatic agent consists essentially of a mixture of polyethylene glycol and glyceryl monostearate, which mixture is present in an amount of from about 0.4 to about 2 percent by weight, based on the total weight of the composition.
Claim 22
Dependent Claim
16 words
The composition according to claim 11, wherein said metal hydroxy carboxylate salt is calcium 12-hydroxy stearate.
References Cited (Backward Citations)
No citation records indexed.
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