Shape memory products and method for making them
AssigneeTyco Electronics UK Ltd.
InventorSreeni Kurup
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Abstract
A method for producing a heat-shrinkable product is provided. First, a polymer composition containing a polymer, a crosslinking agent and a micro-encapsulated foaming agent uniformly dispensed therein is melt mixed. The foaming agent has a peak activation temperature which is higher than a temperature of the melt mixing. Next, the polymer composition is injection molded into a molded product. This carried out at the peak activation temperature to activate the foaming agent. Then, the molded product is crosslinked within the mold.
Claims20
A method for producing a shape memory product comprising the steps of:
- melt mixing a polymer composition containing a polyethylene polymer, an organic peroxide crosslinking agent, and a micro-encapsulated foaming agent uniformly dispensed therein, the foaming agent having a peak activation temperature which is higher than a temperature of the melt mixing;
- injection molding the polymer composition into a molded product, the injection molding carried out at the peak activation temperature to activate the micro-encapsulated foaming agent;
- and
- crosslinking the molded product within a mold.
A method for producing a shape memory product comprising the steps of:
- melt mixing a polymer composition containing a polyethylene polymer, a crosslinking agent, and a micro-encapsulated foaming agent uniformly dispensed therein, the foaming agent having a peak activation temperature which is higher than a temperature of the melt mixing;
- injection molding the polymer composition into a molded product, the injection molding carried out at the peak activation temperature to activate the micro-encapsulated foaming agent;
- and
- crosslinking the molded product within a mold having a mold temperature in a range from 170 to 210° C.
A method for producing a shape memory product comprising the steps of:
- melt mixing a polymer composition containing a polyethylene polymer, a crosslinking agent, and a micro-encapsulated foaming agent uniformly dispensed therein, the foaming agent having a peak activation temperature which is higher than a temperature of the melt mixing;
- injection molding the polymer composition into a molded product, the injection molding carried out at the peak activation temperature in a range of 120 to 160° C. to activate the micro-encapsulated foaming agent and at a pressure in a range of 10 to 20 MPa;
- and
- crosslinking the molded product within a mold having a mold temperature in a range of 170 to 210° C.
Dependencies are inferred from the claim text.