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Description 1, title of the invention
3. Detailed Description of the Invention The present invention relates to novel molding agents,
namely phenol and phenol. Conventionally, the edge of the speaker has a structure in which a
base material such as cotton impregnated with a phenol resin as a forming agent is heated and
pressurized to be formed into a predetermined shape (roll or the like) and then coated with a
braking agent so-called edge paint. There were the following drawbacks. That is, since the phenol
resin as a molding agent is hard and brittle, has low flexibility and is not elastic enough, it can be
damaged by large-scale radical vibration with a large amplitude, continuous use for a long time,
and elasticity And vibration characteristics such as linearity with respect to displacement
deteriorate. In addition, since the phenol resin does not cure 100% by heating at the time of
molding, it absorbs moisture and becomes soft, and the supporting function of the vibration
system deteriorates, and the absorption attenuation of the vibration wave that propagates the
edge with damping agent alone In particular, resonance, especially anti-resonance between the
edge and the cone, and abnormal vibration such as rolling and wave nail resonance are likely to
occur, and sharp peaks and dips in the frequency characteristic are disturbed or broken, and
distortion is small. The present invention, which had drawbacks such as the fact that ordinary
frequency characteristics can not be obtained, was made to improve the conventional defects as
described above, and features of the present invention are phenol and polybutadiene as molding
agents. The point is that chemically modified and integrated modified phenolic resin is used.
After the reaction between the mixture and polybutadiene in the presence of an acid catalyst,
EndPage: 18 alone or in combination with an oligomer of an inpropenyl phenol or inpropenyl
phenol, is further reacted in the presence of a phenol and an acid catalyst, and then The modified
phenolic resin obtained by reacting the reaction product with formaldehyde as a part of the
phenol component is used as a forming agent, and the base fabric is impregnated with the
forming agent and formed into a predetermined shape. It is an edge. An inpropenyl leveneol used
in the present invention is an oligomer thereof. W, a compound represented by ■. (In 弐 M, ll, n
represents an integer of θ to 18) In each of the above formulas, the hydroxyl group may be
located at any of the ortho, meta or para positions, or a mixture thereof. Monomers,-guimers and
trimers can be synthesized as pure conjugates, but tetramer or higher oligomers coexist as a
mixture, and these monomers and oligomers can be either alone or in the form of a mixture. Also
The polybutadiene used in the present invention is a polybutadiene homopolymer-polybutadiene
copolymer, and the butadiene component is a single or a mixture of 1.2 structure or 1.4
structure. There are some types of polybutadienes with different end groups such as
polymacdiene glycol, polybutadiene carboxylic acid, epoxidized polybutadiene, urethaneized
polybutadiene etc., but there is no restriction due to the terminal groups, etc. Polybutadiene can
be used-and examples of polybutadiene-one copolymer 1 include acrylonitrile-butadiene
copolymer and the like. Examples of the phenols used in the present invention include phenols,
cresols, alkyl thiophenes such as xyle / yl, polyhydric alcohols such as ++ bisphenol A1
phenylphenol and the like. The modified phenol resin described above can be obtained, for
example, by the following method, but is not limited thereto. (Example) Inpropenyl phenol
oligomer 1029 having a composition of 90% by weight of P-inpropenyl phenol 2 and 80% by
weight of 8 parts and 10% by weight of 4f by 10% by weight Polybutadiene having a number
average molecular weight of 650 Add 1 Pm of Sumika Oil # 5o) 1 ° 2f and nonylphenol 103f
under stirring at 1-15 ° C, charge P-) Ruene sulfone @ 0.819, and stir for 3 hours (first stage
modification) ). Further, phenol 147 f was added and reacted at 170 ° C. for 2 hours (second
stage denaturation). After the reaction, 87% formalin 195 f and 25% ammonia 9.1 f were added
and reacted at 95 ° C. for 6 hours. When water is removed under reduced pressure and the
contents reach 90 ° C, dehydration is stopped and cooled, and dissolved in a mixed solvent of
hexane, methanol, tanol, acetone 19: 1, and the resin concentration is 50%. Obtained. In the
above example, although the method for obtaining novolac type resin by reacting with
formaldehyde under acid condition is described, after partially reacting under acidity, it is made
alkaline and then made to react with formaldehyde and subsequently novolac type resin. -A
method of obtaining resol type resin or a method of obtaining alkaline or none resol type resin
after modification reaction is also possible. % Of the modified phenolic resin fess is further
dissolved in methanol to make a denatured phenolic resin fes having a concentration of 25% as
tree 11F, which is impregnated into a cotton or other base cloth, and after solvent volatilization,
conditions of 180 ° C. for 1 minute Under the mold, heat and pressure are applied to form a
given shape, and an edge is obtained. As for the molding conditions, the higher the heating
temperature, the shorter the heating time. , 220 ° C-10 seconds, also give good results similar to
the above Example in 240 ° C-4 second condition.
As described above, the modified phenolic resin used in the present invention is (1) a method of
further introducing phenols into polybutadiene (first-stage modification) into which inpropenyl
phenol or its oligomer has been introduced (second-stage modification) Since it is possible to
introduce a large amount of phenyl nuclei into polybutadiene, (1) the crosslink density of the
resin is increased, and both the shapeability of the phenolic resin and the ability to retain the
polybutadiene 11 are both imparted, 2) Physical properties such as uniformity, crater resistance
1, m'r resistance, resistance to resistance, resistance to resistance, resistance to form 7;
dimensionality; excellent in quality, flexibility, etc. The edge of the present invention using such a
modified phenolic resin as a molding agent is particularly (1) flexible, tough, and visco-elastic, so
that radical, large amplitude vibration due to large input can be obtained. Vibration and
deterioration of vibration characteristics are not caused by long-term continuous use, and (2) the
modified phenol resin itself has visco-elasticity, so the vibration is transmitted along the edge in
cooperation with the damping effect of the braking agent If the absorption and attenuation of the
wave is sufficient, the sharp peaks and dips in the frequency characteristics, noise, and
turbulence due to the edge resonance. As a result, the occurrence of distortion is significantly
suppressed, and excellent sound quality can be obtained. Patent Assignee Onkyo Co., Ltd.
Attorney Attorney Satoshi Fire department EndPage: 3
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