Patent ID: 6033610
Filing Date: 2000-03-07
Classification: B29C,B41J,Y10T

Abstract:
A method for forming a leak-resistant joint between a first moldable material and a second moldable polymer blend composition for a printer ink cartridge pen, comprising a sequence of the following steps:molding said first material into a predetermined first structure including a cavity defining the external periphery of an interior standpipe member;positioning said first structure into a mold for injecting said second moldable polymer blend composition;providing said second moldable polymer blend composition, which comprises (A) at least one polymer selected from the group consisting of a polyethylene and a copolymer of ethylene and an alpha-olefin and (B) at least one polymer selected from the group consisting of a polypropylene and a copolymer of propylene and ethylene, wherein (A) is different from (B);injecting said second moldable polymer blend composition in a molten state into said mold wherein said second material fills the outer periphery of said cavity and molds against said first structure to define the external periphery of said standpipe member; andpermitting said second moldable polymer blend composition to cool, thereby forming a leak-resistant seal between said first and second materials about said standpipe member.