Photopolymerizable compositions for encapsulating microelectronic devices

Alec B Scranton; Bharath Rangarajan; Kiran K Baikerikar

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Photopolymerizable compositions for encapsulating microelectronic devices

Patent

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Photopolymerizable compositions for encapsulating microelectronic devices

Alec B Scranton, Bharath Rangarajan and Kiran K Baikerikar

United States Patent and Trademark Office

08/08/2000

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https://patentscope.wipo.int/search/en/detail.jsf?docId=US39250302View

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Abstract

A novel method for producing thick composite parts based upon photopolymerizable compositions is disclosed. Also disclosed are novel methods for encapsulation of microelectronic devices based upon novel photopolymerizable compositions. The constituents of the photopolymerizable mixture comprise a monomer or monomers capable of polymerizing by free radical or cationic mechanisms, and a photoinitiator system which possesses an absorbance characteristic which is effectively reduced, or self-eliminating, upon initiation of the polymerization reaction. Parts having thicknesses up to 2 cm and thicker for varying end use applications are made by photopolymerizing such compositions. In addition, using such compositions composite parts can be made using a reinforcement material such as a glass fiber mat present in an amount by weight of from about 5 to about 70%.

Metallurgy

ADDITIVE MANUFACTURING TECHNOLOGY

ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING

AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING

CHEMISTRY

COMPOSITIONS BASED THEREON

INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS

MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS

ORGANIC MACROMOLECULAR COMPOUNDS

PERFORMING OPERATIONS

SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR

SHAPING OR JOINING OF PLASTICS

THEIR PREPARATION OR CHEMICAL WORKING-UP

TRANSPORTING

WORKING OF PLASTICS

WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

Details

Title: Subtitle: Photopolymerizable compositions for encapsulating microelectronic devices
Creators: Alec B Scranton (Inventor) - University of Iowa, Chemical and Biochemical Engineering
Bharath Rangarajan (Inventor) - Michigan State University
Kiran K Baikerikar (Inventor) - Michigan State University
Contributors: Board of Trustees operating Michigan State University (Assignee)
Resource Type: Patent
Publisher: United States Patent and Trademark Office; United States
Patent: US 6099783 A; United States Patent and Trademark Office (United States, Alexandria) - USPTO; Published; 09/130672; 08/07/1998
Number of pages: 35 pages
Language: English
Date published: 08/08/2000
Academic Unit: Chemical and Biochemical Engineering
Record Identifier: 9984221957202771

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