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Silicon-containing step ladder polymer and a process for producing the same

  • US 4,602,065 A
  • Filed: 09/18/1984
  • Issued: 07/22/1986
  • Est. Priority Date: 09/18/1984
  • Status: Expired due to Term
First Claim
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1. A silicon-containing step ladder polymer(a) comprising repeating units represented by the general formula ##STR14## a unit represented by the general formula ##STR15## and a unit represented by the general formula ##STR16## where R1 represents a hydrocarbon group or fluorine-substituted hydrocarbon group, R2 represents hydrogen or a trialkylsiloxy group, R3 and R4 which may be identical or different with each other, represent individually a hydrocarbon group or fluorine-substituted hydrocarbon group,(b) in the unit (I) the free CH bond is bonded to the free CH2 bond in other unit (I), the free CH2 bond in the unit (II), a hydrocarbon residue of a vinyl polymerization initiator, or hydrogen;

  • the free Si bond is bonded to the free O bond in other unit (I), the free R2 O bond in the unit (II) the free O bond of the unit (III) or independent R2 O;

    the free CH2 bond is bonded to the free CH bond in other unit (I), the free CH bond in the unit (II), a hydrocarbon residue of a vinyl polymerization initiator or hydrogen; and

    the free O bond is bonded to the free Si bond in other unit (I), the free Si bond in the unit (II), the free Si bond in the unit (III), or R2 ;

    (c) in the unit (II), the free CH bond is bonded to the free CH2 bond in the unit (I);

    the free Si bond is bonded to the free O bond in the unit (I); and

    the free CH2 bond is bonded to the free CH bond in the unit (I); and

    the free R2 O bond is bonded to the free Si bond in the unit (I), and(d) a ring structure is constituted by bondings between a free CH2 bond in the unit (I) and a free CH bond in a next unit (I) and between a free O bond in the unit (I) and a free Si bond in the next unit (I) or by bondings between a free CH2 bond in a unit (I) and a free CH bond in a next unit (II) and between a free O bond in the unit (I) and a free Si bond in the next unit (II),(e) in the unit (III), the free Si bond is bonded to the free O bond in the Unit (I), the free O bond in other unit (III), or independent R2 O--;

    the free O bond is bonded to the free Si bond in the unit (I), the free Si bond in other unit (III), or independent R2,(f) the molar ratio of the unit (I) to the unit (II) is between 5;

    1 and 100;

    1 and the molar ratio of the unit (III) to the total amount of the unit (I)+unit (II) is between 1;

    5 and 1-100,(g) a unit chain of the ladder structure constituted with the units selected from the unit (I) and the unit (II) comprises 5-100 units of said selected units.

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