Use of crystalline, crosslinked synthetic resins as a storage material in latent heat stores
First Claim
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1. An improved process of absorbing and releasing thermal energy in a latent heat accumulator using a latent heat storage material, wherein the improvement comprisesemploying as the latent heat storage material a crystalline crosslinked synthetic resin selected from the group consisting of epoxide resins, polyurethane resins, polyester resins and mixtures thereof which contain, as crystallite-forming blocks, radicals of long-chain dicarboxylic acids or dialcohols of the formula I
in which X1 and X2 each represent a --CO--O-- group or a --O-- group in which A denotes a substantially linear radical, in which polymethylene chains alternate regularly with ether oxygen atoms or carboxylic acid ester groups, and the quotient Z/Q, wherein Z is the number of CH2 groups present in the recurring structural element of the radical A and Q is the number of oxygen bridges present in the recurring structural element of the radical A, must be at least 3 and wherein the total number of carbon atoms present in the radical A in alternating carbon chains is at least 30, and wherein the crosslinked crystalline synthetic resin has at least one crystallite melting point.
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Abstract
The invention relates to the use of crystalline resins as storage material in latent heat accumulators. Crystalline synthetic resins replace the crystalline inorganic salt of the known latent heat reservoirs. Preferably epoxide resins, polyurethane resins and polyester resins, which contain very specific long-chain polyester molecule moieties, are used. The crystalline synthetic resins have one or more, preferably two, crystallite melt temperatures.
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Citations
23 Claims
- 1. An improved process of absorbing and releasing thermal energy in a latent heat accumulator using a latent heat storage material, wherein the improvement comprises
employing as the latent heat storage material a crystalline crosslinked synthetic resin selected from the group consisting of epoxide resins, polyurethane resins, polyester resins and mixtures thereof which contain, as crystallite-forming blocks, radicals of long-chain dicarboxylic acids or dialcohols of the formula I - space="preserve" listing-type="equation">X.sup.1 --A--X.sup.2 (I)
in which X1 and X2 each represent a --CO--O-- group or a --O-- group in which A denotes a substantially linear radical, in which polymethylene chains alternate regularly with ether oxygen atoms or carboxylic acid ester groups, and the quotient Z/Q, wherein Z is the number of CH2 groups present in the recurring structural element of the radical A and Q is the number of oxygen bridges present in the recurring structural element of the radical A, must be at least 3 and wherein the total number of carbon atoms present in the radical A in alternating carbon chains is at least 30, and wherein the crosslinked crystalline synthetic resin has at least one crystallite melting point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- 11. A process according to claim 1, characterised in that crystalline, crosslinked epoxide resins (K), which are manufactured by reaction of epoxide compounds, containing two or more epoxide groups.
(a) with polyester-polycarboxylic acids D which essentially contain segments of the formula II - space="preserve" listing-type="equation">--[O--(CH.sub.2).sub.n --O.CO--(CH.sub.2).sub.m --CO].sub.p --(II)
in which n and m are identical or different and denote 2 or a higher number than 2, and to which the condition n+m=6 to 30 applies, and in which p denotes a number from 2 to 40, which, however, is sufficiently large that the segment contains at least 30--CH2 --groups, and (b) with polyester-polycarboxylic acids E which essentially contain segments of the formula III
space="preserve" listing-type="equation">--[O--(CH.sub.2).sub.s --O.CO--(CH.sub.2).sub.r --CO].sub.q --(III)in which s and r are identical or different and denote 2 or a higher number than 2, and to which the condition s+r+2 ≦
n+m applies, and in which q represents a number from 2 to 40, which, however, is sufficiently large that the segment contains at least 30--CH2 --groups, and(c) with curing agents C, in a ratio such that 0.5 to 1.2 equivalents of polyester-polycarboxylic acid are present per equivalent of epoxide compound, that 1/10 to 9/10 of these 0.5 to 1.2 equivalents are attributable to the polyester-polycarboxylic acid D and the remaining 9/10 to 1/10 to the polyester-polycarboxylic acid E, and that zero to 0.6 equivalent of curing agent C is present per equivalent of epoxide compound, with the proviso that, in the cases in which only difunctional epoxide compounds and difunctional polyester-polycarboxylic acids D and E are employed, the epoxide groups must be present in excess and the reaction with a curing agent C is essential are used.
- space="preserve" listing-type="equation">--[O--(CH.sub.2).sub.n --O.CO--(CH.sub.2).sub.m --CO].sub.p --(V)
space="preserve" listing-type="equation">--[O--R.sup.1 --O.CO--R.sup.2 --CO].sub.q -- (VI)
- -naphthoic acid, are employed.
Specification
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Current AssigneeCiba Specialty Chemicals Corp (BASF SE)
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Original AssigneeCiba-Geigy Corporation (Novartis Ag)
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InventorsSchmid, Rolf, Kreibich, Ursula
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Primary Examiner(s)Pitlick, Harris A.
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Application NumberUS05/965,621Time in Patent Office854 DaysField of Search252/70, 126/400, 126/436, 165/104 S, 525/438, 525/, 525/49, 528/60US Class Current252/70CPC Class CodesC08L 2666/18 Polyesters or polycarbonate...C08L 63/00 Compositions of epoxy resin...C09K 5/063 Materials absorbing or libe...
