Thermally decomposable polymer compositions for forming microelectronic assemblies

Patent metadata

Field	Value
Publication number	US-9757818-B2
Application number	US-201615298824-A
Country	US
Kind code	B2
Filing date	Oct 20, 2016
Priority date	Dec 17, 2012
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A thermally decomposable polymer composition comprising a polyester of a dicarboxylic acid and a tertiary cyclohexanediols of Formulae V and VI are disclosed, which are useful in the forming of microelectronic assemblies:

a representative example of a dicarboxylic acid is an oxalic acid and representative example of thermally decomposable polyester is the polyester of the formula:

wherein m is at least about 100.

First claim

The invention claimed is:

1. A sacrificial polymer composition comprising:
a thermally decomposable polymer comprising repeating units derived from an ester of a dicarboxylic acid selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid and adipic acid and a difunctional tertiary alcohol selected from the group consisting of a compound of formula V and a compound of formula VI:

a thermally activated base generator, said thermally activated base generator comprising a cation selected from formula 1, 2, or 3:

where each R e is independently selected from hydrogen, a methyl or ethyl group, a linear, branched or cyclic C 3 -C 12 alkyl group; a linear, branched or cyclic C 3 -C 12 heteroalkyl group having from 1 to 4 heteroatoms independently selected from nitrogen, oxygen or sulfur; a C 6 -C 10 aryl group; a C 5 -C 10 heteroaryl group having from 1 to 4 heteroatoms independently selected from nitrogen, oxygen or sulfur; or where two R 1 groups are taken together with any intervening atoms to form one or more cyclic alkyl or heteroalkyl groups as previously defined, and where for formula 1, at least one R 1 is hydrogen; and
a carrier solvent selected from acetophenone, α-angelicalactone, γ-butyrolactone, n-butyl acetate, diethylene glycol dimethyl ether, ethyl 3-ethoxypropionate, ethyl lactate, 2-heptanone, methyl isobutyl ketone, γ-octanoic lactone and combinations thereof.

2. The composition according to claim 1 , wherein said difunctional tertiary alcohol is:

3. The composition according to claim 1 , wherein said difunctional tertiary alcohol is:

4. The composition according to claim 1 , wherein said polymer is of the formula:

wherein m is at least about 100.

5. The composition of claim 1 , which comprises one or more additives of the formula 1, 2 or 3 selected from tetrabutylammonium acetate (Bu 4 N OAc), tetraethylammonium tosylate (Et 4 N OTs), pyridinium triflate (PyH OTf) or a compound of the formula:

Assignees

• Promerus Llc

Inventors

• Tsang W C Peter
• Bell Andrew
• Zhen Hongshi
• Seto Keitaro

Classifications

• B81C2201/019

  Bonding or gluing multiple substrate layers · CPC title

• H05K2203/0485

  Tacky flux, e.g. for adhering components during mounting · CPC title

• B23K35/3612

  with organic compounds as principal constituents · CPC title

• H05K3/3489

  Composition of fluxes; Application thereof; Other processes of activating the contact surfaces · CPC title

• B23K35/3613

  Polymers, e.g. resins · CPC title