Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-03-18
1999-05-25
Buttner, David
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524285, 524292, 524296, 524321, 524322, 148 23, B23K 35363
Patent
active
059070072
ABSTRACT:
A non-washing soldering flux which is capable of minimizing corrosion and insulation defects due to precipitation of metal salts and cracking of the base resin is disclosed. The flux includes an activator including a dibasic acid with a molecular weight of 250 or less, and a monobasic acid with a molecular weight of from 150 to 300 and/or a dibasic acid with a molecular weight of from 300 to 600. The dibasic acid of molecular weight 250 or less in the flux exhibits sufficient activity, thus ensuring satisfactory solderability. The monobasic acid of molecular weight from 150 to 300 and the dibasic acid of molecular weight from 300 to 600 which are combined therewith promote the activity while also uniformly dispersing the metal salt of the low molecular weight dibasic acid in the flux residue, allowing it to be enveloped by the hydrophobic base resin. For greater cracking resistance, the flux includes at least an acrylic resin of molecular weight 10,000 or less and an activator.
REFERENCES:
patent: 3791027 (1974-02-01), Angelo et al.
patent: 3842023 (1974-10-01), Anagnostou et al.
patent: 4419146 (1983-12-01), Roberts
patent: 5116432 (1992-05-01), Kerner
patent: 5167729 (1992-12-01), Takemoto et al.
Hawley's Condensed Chemical Dictionary 13th Edition p. 18.
Aihara Masami
Ito Naoki
Onishi Tatsushi
Takemoto Masanori
Buttner David
Denso Corporation
Harima Chemicals Inc.
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